The nano cortex sounds very good, really just as good as the big quad cortex, it’s easy to use, feels great.
The phone app is also easy to use and you can find there lots of great captures to work with.
The effects even though they are fixed, the quality is really up there, the best chorus/delay/reverb in quad cortex in my opinion.
If you don’t use more than 4 tones live, it really is the perfect compromise.