Wise from your gwave!
Hyperkin quietly released a new revision, the Supaboy SFC. It looks identical to last year's model, including the stupid 16x9 screen, but it adds the option of playing it in 4:3 mode now as God intended. There seem to be some other tweaks but I never tried the S.
Improvemnts:
It's a bit more comfortable to hold. It's a little thinner than the original system, but due to the larger screen it's actually wider. It's a bit lighter as well.
The dpad is much better now. The super stiffness is gone. It's a little lose like a good third party pad, doesn't quite feel like an original SNES pad but it's decent. Buttons are the same distance from each other as a real pad unlike the original where they were a little too far apart. L and R buttons are serviceable, but I liked the stiffer buttons on the original better. The Start/select buttons on the new model suck balls, but they're only start and select so who cares.
The cartridges are very easy to insert and remove, yet they are solid. Once it's in there you can shake the system all over and it won't miss a beat. The original system would sometimes glitch out.
Audio quality through the headphone jack is improved quite a bit. For one thing it's actually stereo this time, and the humming and noise is gone. It's not super high quality though, but it gets the job done.
The bad news...
The screen. Hyperkin gets so close sometimes, but they always have one critical flaw. Once again it's the screen. While the screen is a clear improvement over the original, it's still composite. So it's not nearly as sharp as a handheld made in 2018 probably should be. It doesn't seem to suffer from most of the composite artifacts that plagued the earlier units, it has better viewing angles, and I can actually read the text in Secret of Mana on this. The color is actually a bit weaker so it's a little washed out. Overall it's a much better screen than the old model but it leaves a lot to be desired.
Anyway, it's still the best way to play a real SNES cartridge on the go, but there's still room for improvement. If they could just put a decent screen on it it would be gold. If you don't care about playing real cartridges though, using a New 3DS's SNES VC games or a GPD handheld would be a better option I think.