I purchased the Esquis as a present, which stayed with me for a few days, so I had the time to fiddle around with it. First of all - it is a different beast from all the other keyboards I have been using. The backlight is extremely helpful and it in general, it would push you to explore your limits, which is very, very nice. Easy to connect to external sound sources (I use Ableton with Kontakt mostly).
The only downside I would like to mention is that the keys require force, greater than the other synths. I have big hands, and that is perfectly fine for me, but more delicate players might find it tricky to get the best from their stroke and aftertouch.
Definitely would recommend!