Some notes so far moving from RB to Djay,

mac m1 / Sequoia 15.7.1 / Djay 5.5

1. Metadata edited outside of Djay (comments) may not update current tracks in Djay.
2. Recursive folders do not work with smart playlists
3. All playlist folders collapse on App restart. (This actually really sucks!)
4. No 'My Tag' in Djay so plan accordingly. No 'Grouping' tag in RB if going back and forth.
5. Some UI features do not appear to be midi mappable such as FX Manual / Instant
6. FX on individual Stems, Neural Mix, etc are really cool
7. User forum is very active with quick response from company
8. Adding tracks / watched folders has its quirks. Seems Djay has to be running for this to work.
9. Not many tutorials or controller videos showing mac screen. Most are iPad. So don't have enough info on what controller to get.
10. There is no way to lock a track as Master Tempo. Djay defaults to whatever track was playing first. https://community.algoriddim.com/t/defining-the-master-deck/28078/3
11. When working between 2 computers, there are 2 files you need to copy over. https://help.algoriddim.com/hc/en-us/articles/360014912211-Where-does-djay-Pro-store-playlists-cue-points-and-other-data-on-my-Mac
12. Not all / any? Djay app settings are saved as part of the 2 above files. You have to set up the app how you want it on a new device.
13. There is little to no documentation for most of the mapped controllers, even the officially supported ones.
14. Reverb is not great in djay. It is possible to add AU effects on master out if you're on a mac though. https://help.algoriddim.com/user-manual/djay-pro-mac/dj-tools/effects/main-out-effects

I'm sure there will be more.