Neither SNES, nor Mega Drives/Genesis consoles are hard to find or expensive, same goes for proper multi-format (PAL/NTSC/SECAM) RGB monitors or TV sets. All you need for the proper experience is a console, a monitor (for ex. a nice Philips CM8833 or Commodore 1084S, of which there are lots and lots about), a step-down convertor and possibly some wall plug adaptors, and off ye go. If you really want to play the games on a bigger screen, there are lots of hardware-based options for that, even though I have absolutely no idea why I would want that. Genny games in HDMI on a flat screen with loads of lag? Dunno about you but that's not my idea of "classic gaming".
Quite a few FPGA-based systems have flaws, mainly timing-wise. FPGA is a way to recreate chips and chipsets but that alone isn't enough to properly mimic a certain system, timing between all the components is essential, and so far I haven't seen a FPGA machine that is 100% accurate in that regard. Even very small timing inaccuracies can spoil the fun, many games just don't feel right. This may not be a problem for casual use but if you're serious about your games, it's just not acceptable. Imagine playing KoF or Samsho on a system where the timing is off... unpossibel!!11!
I mean, it's nice to be able to recreate very old and obscure computer or gaming systems of which there only are a handful original machines left but I really can't see the point in case of very common machines like 90s game consoles.
I don't hate on "this guy's" products btw., I don't even know him and don't plan to change that.