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I never cared for them much, personally, because of their playability. They are a little more difficult to string, especially on a dense string bed, but don't string the same way as gut and similar strings. With Babolat Hurricane, for instance, you can pull it through without too many worries at all because it is smooth and a tough. But the last few pulls are the hardest. The string is best suited for fast swings with topspin. It is is said to cup the ball more than other strings.
Benefits: more spin, ball does not sail out as much, durability.
Drawbacks: less playability, less power, less comfort, and can help add to tennis elbow for some players.
If you look at what the male pro's are using on the tour the mix is just under half for those who use poly and less for the female pro's. When you go down further in level, in my opinion there should be even less using poly or kevlar strings.
^^^^Agree with John. Pros are more spin and durability because string move much less than a nylon/syn gut. You can also take full whacks at the ball because generally you need to generate your own power/racquet head speed with poly The service return skills have changed so much because of poly (you can take hard swings at the ball and still have the return go in). Cons are the strings are initially stiff and lack feel and power.
I use a natural gut/poly hybrid (Global gut in mains and CyberFlash in crosses). I use to use syn gut in the crosses but felt the poly tames the power of the gut while not giving up (as much of) the feel.
If you have arm problems (wrist, shoulder, etc.) I wouldn't look at poly, even at low tensions. Natural gut would be the best if you're recovering.
As far as the actual stringing, I not a big fan of stringing a full bed. It's stiff and hard to pull at times, especially as John mentioned the last few crosses. Tying knots on polys are a bit challenging since they are stiff and slippery. They don't cinch up particularly well at times.
Polys can benefit even the old school players with either the long loop/flat, or the short shoulder turn/compact game. I have converted several 50+ year old doubles specialist to Kirschbaum Pro Line 2 16L to 18 gauge. This string has high playability and has a firm, but forgiving feel.
At first, the best serve and volleyer of the bunch told me he said it has a very decent feel at 16L. Now, he is hooked at 17 and 18 gauges! The other guy told me it was the best string job he's ever had.
If playability is the issue and you'd like to maintain some of the touch shots and finesse, I recommend this string or Luxilon Ace in full, not hybrid, anywhere from 57 lbs to 61 lbs, depending on your game.
As for hybrids, I had a great experience with Tecnifibre Red Code 17/ X-One Biphase 17 at 59 lbs/61 lbs. I had this in a KPro Staff. Very smooth, not jarring, great directional control, muted feel but good for doubles' short angles and variety.
Then I had the same Red Code (cross) with VS Gut (main) at 59/61 lbs. I had that in a Volkl Powerbridge 10 MP. Even better feel and greater smoothness due to the gut's greater elasticity. Even lasted me four weeks.
My latest great hybrid is Luxilon Alu Power/Boris Becker Bomber 16 at 54/57lbs. I had that in a Head Microgel Prestige Pro. Smooth, controlled, muted, gave the Microgel some added power but within player racquet sensibility.
I do like Wilson K Gut and Gamma Livewire in the multi category, but I have converted to Signum Pro Tornado for that soft feel with added spin through texture.
Well, why not try Tecnifibre Red Code at 54 and your regular multi, NRG at the tension you have it, 57 lbs? Try that first and see if that helps with your ball control. It should curb some of the bounce of the NRG and give you a little extra cut on the ball. Red Code at 54 is not going to hurt your arm.
If from that point you think it feels too dull and not crisp enough, try Red Code at 56lbs and NRG at 58, adding 2 lbs to each string. You must have only a maximum 3-4 lbs difference between the poly and the multi, the multi being higher.
I personally liked it at 59 Red Code/ 61 multi. But I have gone lower as well, and have had good results.