Too soon? Yeah, maybe -- especially if you haven't been able to get your hands on the 2016 editions yet. Those are supposedly the last ones on the old hardware platform, and possibly the last ones to support analog audiovisual cables for use on older televisions. I think they're all worth a look/play/buy, particularly the Atari Flashback Portable, which marks the first time we've seen an official portable release of the Atari 2600 games, along with an SD card slot for bringing your own ROMs.
Better emulation fidelity/compatibility
Fixed sound for Sega Genesis
Dropped newer but "classic-style" games that padded the game count on the Sega units
I look forward to better Genesis emulation. It would be particularly cool if 32X, Master System, Game Gear, and Sega CD support could be added. I could handle slicker hardware, but the cheapo plastic AtGames portable unit isn't bad for the price.
Arcade emulation would be nice to have, we don't get enough of that in my opinion.
Is there a good reason to sell separate units that basically do the same thing? A combined Sega/Atari/maybe something else unit would be excellent.
What would you like to see?