It is pretty amazing.
I don't think I'd go for one myself (although I know a couple of creative folks who are GASing for one).
I mean, from my own perspective:
- It looks like one of those blow-up guitars
- It's made of plastic!
- It has one of those awful telephone things attached to it
- Does it even work without the awful telephone thing?
But then, I'm an old git, stuck in my ways, buying "proper gear".
The concept of "quick wins" when learning is very powerful, though. And some youngster starting out isn't going to be so hung up on <insert guitar name> or tonewoods, or A5 versus A4 magnets, etc, etc. I do think it could be an INCREDIBLE learning tool... but I kinda imagine a 14 year old, with the amazing chops he or she has learned already, turning up to a band practice with it and getting laughed out the room... "Hey mum - I need a proper guitar and amp now".
The folks I know who want one are my age, songwriters, not particularly "into" guitars, and they already use their "awful telephone" things to write and record stuff (that actually sounds amazing!).