I have a seaboard block and I really like it. I wanted a small bluetooth keyboard to use with an ipad, so it was the roli or a korg. The bluetooth is fine for noodling but I’d never perform with it, seems to jump around.
The lack of faders and no high C note on the block version is a bit annoying but no big deal, its a nice keyboard to play and small to chuck in a bag which is what I was after. The rise versions have the additional controls.
The sounds are great but if you create a patch using the desktop tool (equator) theres no way to transfer it to the iOS plugin which is a bummer. Theres also a utility you can use to set up what cc’s it sends, velocity/response curves and things like that for mac/windows but not ios. If you do make changes it will be saved on the device so you can set it how you want and still use it with ios, you just have to do it on a pc/mac.
Only a few ios instruments support mpe (the animoog ones), but using it as a normal midi keyboard works fine with non-mpe stuff. You can either configure which midi channels to send/receive in the the daw or synth app, but I typically dont bother and it usually all works fine.
You can configure it to send poly aftertouch or channel pressure iirc.