I'm about to test this. I got my multicart and most NTSC retail games are fine but demos just don't work on my Synertek 6502. It's a crap CPU, but my Rockwell - Mexico-12 one died. If you order a CPU from Best, you're gonna get a Synertek.
I've ordered the PCB's and the new W65C02S with supporting Logic Chips. I'll start a new thread for the testing report. Hoping to have it soldered up and tested end of next week.