I've got one of those, bought and installed it a few years ago. Unfortunately it doesn't work with all games. Maybe that has been fixed, but was very annoying to find that hydro thunder didn't work!
https://www.dreamcast-talk.com/forum/viewtopic.php?f=5&t=165...
To be honest I now pretty much just play Dreamcast games via the redream emulator on my steam deck and pc under my TV. Though obviously there are drawbacks with emulating. Every so often I bother to setup my Dreamcast with my ossc and play on real hardware.