Of course benchmarks aren't everything on the phones the S3 , Onex are still superior phones due to more ram , screen , size, etc but still for $149 this phone (it has ICS 4.0.4 too) with Metro's LTE (more like 3g+) it's an amazing phone and have been testing network speeds here in San Francisco and I'm avg'ing 4-5mbps . Sprint 's 3g network = 448kbps lol .
My dad just got a S3 with Verizon and i have the Motion 4G. Other than the screen size, resolution (which sometimes effects games & apps but not very many) and 5MP camera, they're pretty similar. I was running the two side by side and both seem to run the same speed with apps, games and such. The internet is drastically different though, lol. I'd, no doubt, pay full price for a One X+ if i could afford/tolerate AT&T. If the One X+ would come to Sprint/T-Mo/Metro/Verizon I'd buy it release day. I'm looking into the Optimus G right now though.