Anyone who wielded / currently using these racquets? As my AT900T (3Ug4) is saying goodbye to me, I need to buy a new one. Please compare the given racquets using these bases: Stiffness Power Defense Maneuverability Balance Grip length Which one requires higher muscular strength (because sometimes my deltoid muscle hurts after powerful smashes)? If I will choose between mx80 and Z-slash, which one is closer to AT900T? In terms of hold/repulsion, swing speed, head heaviness? I had also used AT800DEF, which is a 4ug5 which I like the way it handles my shots. But compared to AT900T, for me, 800Def is better but 800Def is now rare. I like 3U over 4U. I am in love with At900T, but I think it is hard to find brand new ones nowadays (correct me if I am wrong). Thanks a lot.