The A.T.A.R.I. Art Pack will work on the AFB9s or the AFBXs. At some point it should be easy to pick one up cheap.
The Arcade Flyer/Boxart Art Pack and the LFB2019 New Art Pack are for the older LFB2018 with the CFW. I'm sure you can pick one of those up cheaply. No Atari2600 or ColecoVision support though. The idea with these is if you want to add a lot of games to you main game list convert the atgames thumbnails to flyers and box art, so you can easily add more stuff that matches, instead of creating similar atgames style thumbnails, which sucks btw. The 2nd, New Art pack is if you wanted to turn your 2018 into a 2019 or 2019 deluxe in appearance. And to be completely honest, for some reason no one cares if you build a pack of 1000+ Atari roms and share them, for whatever reason, don't ask me. With this system, however, I wouldn't create all in one art and rom packs. Just some art only packs to start you guys on your own lists. Just because of how much larger in size these games are, and *chough* Nintendo *cough* Disney.
I thought the unreleased CFW for the LFB2019 worked great. I had hoped to create art packs for it as well. But for reasons stated above it was never released. I totally get it though, the new replacement roms for the broken Disney games were encrypted and put in the emulator partition. They would have been distributed in the CFW files.
At this point you basically want to find a 2018 unit. With the new CFW you can add all the new 2019's built in games and artwork to it easily. The unreleased CFW was for the 2019 standard edition, one wasn't made for the deluxe to my knowledge, so Atari 2600 was not supported. It also broke Fix-It Felix Jr. while the CFW was running. the CFW didn't dump sub folders, which Fix-It Felix was structured as. (IIRC rrifonas said it was the PC version) Removing the sd card and playing normal would allow you to play Fix-It Felix again. I'm sure most if not all of these issues could have been resolved. I personally run my Atari roms on the AFB9/X. But basically ColecoVision is all that was gained. And on a side note D+Start for adding coins was removed as an option on atgames side of things, as rrifonas stated above. pressing menu on a 6 button OG sega pad or the menu button twice fast on the unit is how you added coins. vertical shooters got stretched. that's about all I remember.
I still have a 2nd LFB2019 running the CFW, colecovision romset is running from the SD Card but its not ideal to play coleco on a 6 button pad. the onscreen coleco controller pops up when playing the roms from the sd card, so that's good. I didn't do anything with the main game list menu except test stuff, I never modded it or added any games. My idea at this point with this unit is to have it be its own thing running only the colecovision games set.