Lately, though, it looks like all clone console manufacturers are cheapening out on their clones, and I have various examples:
-FC Twin: Since the FC Twin Version 3, it's had overblown NES audio
-Retro Entertainment System: The NOAC appears to have been downgraded to one with reversed duty cycles (mine has an NOAC with 90% accurate audio, so I don't know what the deal is with the RES I saw that had incorrect audio)
-RetroN3: Super NES audio is murdered on the RetroN3 Version 2, Castlevania III compatibility has been removed from the new RetroN3 Version 3 (I was shocked to see this and completely disgusted - NEVER have I seen a clone manufacturer go to this extreme)
-RetroN2: Super NES audio is in dual Mono (are you f***ing kidding me?!)
To me, it seems as if Yobo Gameware is the only clone manufacturer that doesn't constantly degrade their hardware as it ages (only the FC Twin appears to have fallen victim to this, but if anyone has come across a different Yobo clone that's been degraded, let me know). Hyperkin is ESPECIALLY guilty of this with both the RetroN3 Version 2 and RetroN3 Version 3 as well as the new RetroN2, which just seems to be an overpriced FC Twin with very messy S-Video (my Electohome 27E510 TV, which is very tolerant of strong video signals, had serious sync issues whenever anything white would show on screen, and my capture device was having so much trouble, it wanted to completely lose the video feed), NES controller ports and worse build quality (cheap plastic, a system selector switch that feels like it's going to break in your hands and very poor finish on the paint). There are still some pretty decent clones out there, but one shouldn't all-out avoid them unless they want a 100% authentic experience, in which case, you should avoid the vast majority of clones (I say the vast majority as there are some Super Famiclones that are spot-on accurate (or very close to it) to the Super NES). If someone just wants a system to play their games on and isn't so fussy about accuracy, then by all means, get a 2-in-1 (FC Twin, RetroDuo with NES audio fix) or 3-in-1 (FC3 Plus, please - the RetroN3 has become garbage) clone. Just don't get anything made by AtGames. Even the worst NOACs with reversed duty cycles and crappy mixing are better than any of AtGames' software emulated solutions as even with their audio flaws, game are still somewhat recognizable, but with AtGames' shit, absolutely nothing is recognizable.