I'm a 5.0 all court player that hits heavy/moderate spin Here is a video of me playing http://www.youtube.com/watch?v=fTTQDJggqmM I have tried just about every type of string and tension I currently play with the prince ex03 warrier , stock weight, with string hole inserts. Grip #3 with 2 over grips I string my own frames with a cheap drop weight, but I take special care to go slow to make sure its a quality job. I like to string full poly at 45 up to 50lbs, gut/syn at 48 up to 54 lbs (sometimes same tension both and sometimes 2-5lbs difference), gut/poly 55 up to 60lbs ( with the same tension both and sometimes 2-5lbs difference) 2 hours average: With full poly I get about 2-4hrs max before it needs to be cut out due to loss of resiliency. It will start to move around with noticeable loss of control. I could extend it to 6-8hrs if I was just playing doubles with shorter points then singles. A fresh new poly frame for each set or match would be needed to keep consistent play. 3 hrs average: With poly mains and syn gut ( og sheep micro) cross I get about 1.5 singles matches or 3-5 hrs max before it needs to be cut out due to loss of resiliency. It will start to move around with noticeable loss of control. A fresh new hybrid set up for each match would be needed to keep consistent play. This set up is a dream to string. 10 hrs average: With gut mains and poly cross I get the longest durability and play-ability of any set up. I can go until the string breaks which might be 25hrs If I use string savers. Without any string savers I can get about 10-15hrs of singles, and much much more if doubles. Being able to use just 1 racquet for a whole tournament is priceless. :twisted: Conclusion Top Price/Performance: Gut / Poly wins no contest. The length of time I get in every category is well worth the cost of gut in the mains. Actually I save time/money using gut. Better to pay a bit more up front and get the best rewards IMO. Preferred gut = Tonic + Long Life 15g Preferred poly= Genesis Black magic 17g or 16g ps: I did not mention multi's as they break after 1 set for me, so its not worth using at all IMO.