Then problem #2 with the display (mostly) is latency. Those CRTs were fast. Even 50ms of rendering latency is noticeable on a some of the console games that require very-precise input timing.
You get emulation latency (this may avoid that by using ASICs, at least); input latency above what the original hardware had, if you're not using the real thing (bluetooth...); any picture-conversion latency (this might avoid that, but I wouldn't bet on it) to digitize the signal into HDMI if you're working with real hardware with analog outputs; TVs that struggle to get under 50ms of latency, especially without making the picture look a ton worse; and then shader-induced latency if you're trying to make it look semi-correct. Like, getting it down to where it doesn't feel wrong is tricky as hell.
With something like the MiSTer, you can also enable high speed USB polling, which I believe is roughly 1000hz. My understanding is that it doesn't work with all controllers, but it has worked with all the controllers I have tried it with.
The composite video artifacts are definitely noticeable though; I noticed the weirdness of the waterfalls in Sonic when I was playing it recently. It doesn't bother me that much but I could see why it bothers other people.
Retro arch has run ahead latency reduction etc, I'd like to see some comparisons of that Vs mister. I could do it myself but I've never got round to it. I've noticed that fiddling with latency reduction in retro arch really works, but it is a lot of fiddling.
As John Carmack said once, we can send a data packet across the atlantic faster than we can get a pixel out the back of a computer nowadays.
Displays are no longer the problem anymore, we're back to CRT speeds again.
The biggest concern I have is accuracy. SNK wouldn't be able to just start manufacturing their old chip designs from the 90s again because a lot of the chips in the Neo Geo from other companies are no longer made, such as the 68000, Z80, and YM2610. This means that they'd have to make a new SoC that incorporates the IP from those chips. At that point there's no real benefit to the ASIC over an FPGA. It means the system costs less to produce, but if they find any inaccuracies in their new SoC design they won't be able to release an update to fix them. I'm cautiously optimistic, but I'm not going to place a pre-order until they release more details about what exactly is going on under the hood.
I think I'll pass giving them a single cent.
Makes me feel a little conflicted having bought one of those SNK bundles a couple years ago on Steam or Humble Bundle or something. Don't love the idea of giving money to someone like that.
He won't get a cent when I play on my MVS carts on actual hardware, so there is that.
If instead one want the real HW, a working MVS PCB can be found for less that €100. A JAMMA cabinet would be the perfect place to use it, but with a supergun a CRT TV can give the same results. Cheap superguns can be found or built for around €30, fancy models can cost between €200 to €300 tho.
The carts aren't cheap tho, specially if original. I've only a battered "Puzzle Bobble" cart, it's a really fun game in PvP, but probably not the more iconic NeoGeo title.