Hi, I learned in this forum that the spin increases if one uses gut mains / poly crosses instead of a full bed of gut. This is due to the snapback that is better if there is a smooth cross string on which the gut mains can glide. Also arm protection should be quite good with gut/poly since the mains are responible for the feeling of the stringbed much more than the crosses (some say 75% to 25%). Another advantage of gut/poly vs full bed of gut is the price... So what are the reasons for a full bed of gut as gut/poly is superior in so many ways? I can only think of one thing and want to ask you what you think about it: what about the playability duration of gut/poly vs gut/gut? Gut holds tension longer than any poly and does not die. If I use poly crosses this poly should die after e.g. 10 hours playing time. Now my question is: does this matter? Or is the "still-alive-gut-in-the-mains" so much more important that the dead poly cross does not matter? The reason I ask this: I want to play at least about 20-30 hours with one stringjob as my stringer is far away and I don't want to take my racquet there one or twice a month. I play two times a week and I'm no string breaker. I hate to play with dead polys since the feeling is so terrible (fresh polys play great by the way, maybe even nicer than multi or gut) and my arm also hates dead polys. Thanks!