I've had the Lava Genie now for around 10 days but, as I work full-time, I've only managed about 8 hours of 'actual practice' so far.
Even so, I have managed to play a few songs with help from the Lava+ App (which is being developed regularly (AI options coming soon, more and more songs and Presets being added and so on).
Unfortunately, what I have realised is that you REALLY do need to sing along with the music otherwise it doesn't really 'work' (I've not really found any purely instrumental songs to learn/play as yet) which is a bit of a problem for me as, obviously, I can't sing for sh@t (plus I find myself having to multitask between playing the Lava Genie and following the chords and/or lyrics in the app (I am hoping to be able to do without the App as much as possible over time).
Still think it's a marvellous bit of kit nonetheless!