I started out using the community ROM for about a year and it worked well. I would not say it was great but I had to figure out how to root it so that I could improve performance. After rooting the community edition, I think my experience was good and if I remember correctly, most apps worked well on it. I also have a Nvidia Sheild Pro, so I figured I would give slimbox a try on my Minix to see if that would improve my experience on it compared to Nvidia. First off I went through a few virus scans to ensure that it was virus free, then I proceeded to install the ATV version of SLimbox. I noticed a big increase in performance on the box. I compared it to Nvidia with 4K and it was very close to Nvidia in performance. The other upside was that it was now running android 9 pie so that helped to future proof the box. I removed most of the included apps that came installed, since they were not relevent to me and loaded most all of the apps that I use. I've been using my Minix u9 on SLimbox for a few months now and I have to say that my experience is GREAT. I would highly recommend it.
To be fair with my assessment, now for the negatives that I discovered. There are a few cons but not enough to dissuade me on it. Firstly, the power off or shut down function puts the box into sleep mode not off. I just unplug the box after I shut it down. Unless you solder the board like they ask, the three USB ports will not work, but to bypass that I simply used the OTG cable and port on the box and simply added USB extension ports externally. Easy solution. Finally, there was one or two apps that I was unable to install on the box because the app said that the OS manufacture was not recognized. Apps like ITX would not install. I have installed many many apps without issue, so that one negative was not a real deal breaker. I have not had the remote problems others have talked about, but maybe it might be related to the power off function I spoke about.
I think I covered all my bases regarding SLimbox and in conclusion, I give Slimbox a big thumbs up.
CHeers,