After a few days with it (latest firmware) I have nothing but positive impressions for the experience, the hardware and the 8bitdo NES30 controller (with wireless dongle), WOW.
I was just going to "test" things out but I ended up playing though quite a few NES games I owned. Feels great.
This makes me look forward to the Nt mini as well. I'm taking the Nt with me to Tokyo for the next 10 days and will hunt for Famicom games/play/record and stream during my downtime from Tokyo Game Show. Really looking forward to it