I had a similar chinese headunit a few years ago(Eonon). Out of the box and for the first year it was great, second year it started to get glitchy and slower but still functional, by the third year it was almost unusable. But that was about 5 years ago, so I would imagine they have gotten better. I think the main reason of the degradation was they stop providing updates for the software after they are about a year old.I really like the one I put in my truck (got mah wife the same one). Android based cheap jobby, but got the rear view camera and the dash cam. No OBDII on the 80, so that's not really relevant.
Edit: I should probably at least mention the head unit is an Atoto S8