I have the NUX, and this is how I see it.
PROS:
- good battery life (I haven't discharged it fully, but I consistently get 4-5 hours of playtime)
- lot of sound choices - several bass amp and cabinet models guarantee that you'll find something to your liking.
- inbuilt effects - you can choose between modulations, reverb, delay and distortions
(You need a phone app to access these)
- 7 programmable presets accessible with a push of a button
- you can play the music from your phone - the Mighty Plug shows as bluetooth speaker/headphones.
- output is more than strong enough to drive lower impedance phones.
- It sounds good with simple in-ear headphones, you don't necessarily need to use over-ear headphones.
CONS
- there is no master volume pot. I know it sounds like a big deal, but it's not actually that bad. There is a 3rd party android app called Mightier Amp that has a master volume slider so that sort of compensates for missing physical pot
- My first unit broke - guitar plug started losing contact so I had to be careful of the position and angle. No problem, I got a replacement which works now.
- it supposedly works as a USB interface, but I couldn't make it work with Windows 10. (I admit I didn't spend a lot of time trying it)
Would I buy it again? Yes, definitely. It is invaluable tool for practicing and learning new material.