The X-Arcade build quality is as good as any top-shelf stick out there.
However, the hardcore modders say the PCB is rubbish, and the hardcore 2D/3D fighters say the American buttons and sticks (the actual stick component) are awfully hard to use and sometimes unresponsible when paired with the poor PCB.
I've never used an X-Arcade first hand, but I have used set-ups with American buttons/sticks (most Australian arcades use them), and they're definately not as good for technical gaming. Better for bashing, though.
It's also very hard to find converters for different paltforms that don't suffer any input lag. Best to buy specifically for the system you'll be playing on.
Well I pretty much use it for bashing and space invaders/mame. It works fine for that. I've had some issues with configuring it for C64 and Amiga emulation, but I can plug my old DB9 joysticks into the PC for them anyway.
Mebbe I should try it out with some real PC games and let you know?? Or even on the PS3... (dont have one)