Grays Megablade 160

I had a couple of Wilson racquet's for almost 20 years and recently upgraded to the Grays Megablade. It broke along the shaft after six months of a weekly social game (not competition). I replaced it on the night with a Grays Cambridge 160 which lost it's tension in the second week of play (became lame & powerless). Unfortunately they do not leave enough string on these racquet's to retension and retie, so it needs to be restrung after a couple of hours of play. I haven't been able to get a refund on either racquet yet. I may be a little slow, but it won't take a third Grays racquet for me to wise up, so I am off to look at Head racquet's. There must be a reason so many professionals play with them :)