As far as how the JM performs, I will say it's given me rock-solid performance thus far and has handled just about everything I've thrown at it perfectly smoothly. I just played through Crysis 3 on it a few days ago on... High (not Very High; that slowed down juuust enough to be noticeable) settings, and it was smooth through the whole game. Same for Bioshock Infinite, another big graphics-intensive game. Even emulators like Dolphin and PCSX2, which are heavy on the CPU, run fine.
That said... I'd probably still opt for the JS. The JM still has its BSOD issue if you aren't using the 332.60 driver or older. I wouldn't consider this an issue if I hadn't used newer drivers like 340.52 and seen the big performance boost, then had to switch back because of BSODs. I find it odd that others are saying the BSODs are fixed; for me, the 340.52 driver still BSOD'd after about a week. Not nearly as often as everything between 332.60 and that, but still often enough to be frustrating when I lose everything I was doing out of the blue. Hopefully ASUS and Nvidia can do something about this, because as it stands it's rather unacceptable.
