Think about the possible permutations when constructing a tennis racket. Seriously, take any major brand and look at the multiple iterations they produce to account for the vast appetite from players of all skill levels.

Some are created with power in mind, others with spin or control or speed. Which one do you buy? Help!

Here’s where Head Tennis can assist. In its latest line, the Graphene XT, you, the consumer, can toggle between a spin-friendly 16-16 string pattern and a more dense 16-19 pattern, which is essentially like getting two rackets for the price of one. With the purchase of a Graphene XT Speed MP A or Graphene XT Speed Rev Pro, Head will send along a second set of grommet strips that you can sub in when re-stringing your racket.

Head is calling it an Adaptive String Pattern (ASP) technology, which, when you think about it, is a pretty novel concept. And the truth is when switching courts and surfaces, you may opt for a control-oriented setup or vice-versa. Now you have that flexibility.

All that being said, while racket manufacturers are becoming smarter and more creative with their bells and whistles, the bottom line is still to produce a solid frame.

So how did Head do to kick off its 2015 line?

Pretty sweet, actually.

I was a big, big fan of the Novak Djokovic-endorsed Speed Pro from earlier this year. It had good weight and a ton of stability with exceptional maneuverability and forgiveness. It was one of the few rackets that excelled in nearly every aspect. If I had one complaint, it was that I had nothing to complain about. Serious, it was a fantastic stick that played much more fluidly than you’d typically get from a 11.8-ounce frame.

Needless to say, I was both excited and skeptical when the latest line of Speed rackets arrived last week. Head says its new Graphene XT technology “features a 30-percent stronger material structure that has been engineered to optimize the racket’s weight distribution to where players need it most.”

Simply, what that means is that the weight of the racket has been moved closer to the tip of the head. The result: Extremely easy power from a racket that is still very maneuverable. I immediately felt the difference in swing weight. Although the MP A version is quite a bit lighter than the Speed Pro from last year, it hit just as heavy because of the weight distribution.

I found this to be especially helpful in the 16-16 setup. I’ve never really gravitated toward these en vogue open patterns. I find them too unpredictable. But in the case of the MP A, because the balance point was higher in the head, it helped keep my swing under control. The result was a ton of spin with minimal effort. And, oh by the way, it had the same fantastic feel as its predecessor, but perhaps a little more buttery smooth. And, to boot, with the open pattern the sweet spot on the frame was enormous. Not a dead spot to be found.

A couple of days later, I cut the stings out and restrung the Graphene XT Speed MP A with the new denser setup. Honestly, I thought I’d like the racket even more. What I found was a ton of control, good power, great spin but the sweet spot had shrunk.

Now granted, there’s a good possibility I strung it too tight. As I started to get into a groove, though, I found the 16-19 pattern far more satisfying. Especially at net where the racket did all the work. One of the most efficient rackets I’ve ever used at net, actually.

The end result was this: This racket is every bit as savory as last year’s model, maybe more so. With the option to open the string bed (or close it), it’s impossible to go wrong. Trust me on this one.

Graphene XT Speed Rev Pro

A very similar feel to the Graphene XT Speed MP A, the Rev Pro comes a little lighter and a little longer. And also with two sets of grommets to change the string pattern.

I enjoyed the extra length on this racket, but at just 10 ounces strung, it was light, though not nearly as fragile as I thought it would be. With a 1-point head-light balance, the racket felt akin to a low 11-ounce racket.

It hit surprisingly heavy for a lightweight. With the extra leverage, I could crank groundstrokes, but there was a noticeable difference when I didn’t meet the sweetspot -- this unlike the MP A.

I added some lead tape around 10 o’clock and 2, which helped the stability quite a bit.

Serving was a gem with this frame. Certainly, my speed increased, as you’d suspect from a longer racket, but it was more the easy, consistent power.

I used this racket with both the 16-16 and 16-19 setup. In this one, I actually preferred the denser pattern, mainly because it helped alleviate some of the instability.

The XT Speed Rev Pro has some good potential. The static weight is low, but a solid option for 3.0-4.0 players. And if you’re enamored with the added length but want more beef, add some tape. Definitely worth a hit.

Head Graphene XT Speed S

At first, I wasn’t sure how the racket would stack up against its slightly heavier Speed MP A brother. It’s more or less the same mold, just a half-millimeter thicker and .4 ounces lighter.

The Speed S, which comes only in a 16-19 pattern, hits a very plush ball. The frame is only one-point head light, though, and that means it hits much heavier off contact than you’d think. The reality is that it’s not terribly different than the MP A, but make no mistake: It is a groundstroke machine.

I often talk about how the best rackets are those that feel like an extension of your arm. The Speed S was certainly that. It hit heavy and with excessive spin. If I could hang back at the baseline all day, I might never put this racket down.

Serving was good, not great. It felt a little unwieldy. This is where the head balance can be an impediment. I didn’t feel this way on either the other two frames in this review -- perhaps because the beam was narrower and thus moves quicker through the air.

This was a really nice frame, one that would appeal to a wide range of players.

Overall, the Graphene XT series is a sweet update. The weight distribution, which now lives closer to the tip of the racket, makes sense. More importantly, though, these frames truly have a unique, precise response. Who doesn’t want a piece of that?