From my post at shmups:
Best: SD2SNES
It's not the flashcart I needed the most (that would be one for the Genesis), and I'm still slowly collecting all the Super FX and SA1 games anyway, but man, what a treat. And coming from the Everdrive N8, it's just so nice to have a menu that doesn't look like ass and the OK/cancel buttons are actually what I'd expect.
Runner-up: Tendak HDMI to VGA converter. No need for my powered HDfury3 anymore.
Worst: Yet another PS4 joystick: Hori RAP V Hayabusa
To be fair, it is a very good stick, it just wasn't a must-have. I read "the one with the headphone jack was faster" than my old one and then seeing it cheap on eBay I had to get it. Then I remembered this tweet and saw that it wasn't even the fastest Hori... so yeah. At least it pairs nice with my old one which has the exact same shape, and maybe I can have a dedicated 4-way stick now.
Runner-up: Pandora's Box 5. I only found out after I bought it that (1) it wasn't even the latest version, and (2) I could've gotten it cheaper on Aliexpress. At first I didn't like that it was HDMI-only, but that just lets me hook it up to my DVDO Edge easier so I could correct the forced 16:9 aspect ratio. As for the games themselves, there's more wrong than right with them (I mean, even Final Fight wasn't perfect), but it plays Armed Police Batrider well enough for me to scratch that itch, at least.
