the gt-1 is kinda inbetween the sr2 and qz2 if im not mistaken. i have the tr2 and recon,and decided on the gt-1 for my benchmark.i got to test both the sr2 and gt-1.the sr2 was drilled a hair stronger but was flipier and snapped off the spot harder.while the gt-1 was for me better it was about 3-5 boards weaker but with a nice smooth arc and nice little pop off the spot. having never thrown the qz2 or any qz line ball cant help ya there.
hope that helps and next week when i get my gt-1 ill look back here and give ya more input,if you havent made a choice by then....good luck and stay motivated!!!