Very powerful, but the pricing is insane. With a lot less money one can buy a full keyboard synthesizer plus a multi track recorder. I don't think that portability alone can justify that price tag.

Examples: https://www.thomann.de/intl/yamaha_mx61_v2_black.htm https://www.thomann.de/intl/zoom_r20.htm And I didn't choose the cheaper ones.

Also, for those into diy electronics, check out the Electrotechnique Tsynth at https://electrotechnique.cc

Demo here: https://www.youtube.com/watch?v=uCA2L7CeWSE