Actually yes, I've been having a go at it. Unfortunately the experience was somewhat soured because by chance I started just before it went F2P with the free trial version on Steam that just basically let you create a character and to a tutorial level.
It was certainly fun and I was looking forward to playing more, but when it did switch over they changed the way you characters powers are assigned and the ones I had been using were suddenly unplayable without a subscription. Basically what they've done is take away what used to be a pretty free form system where you could mix and match powers and abilities to create a unique character and replaced it with a rigid and rather bland class system. Sort of took the fun out of it. That plus when I replayed the tutorial with my "new" build there were about twice as many enemies on the same difficulty level as before, making it a HUGE grind just to get from point A to point B.
As I understand it, you can have the game "unshackled" and back as it used to be before the changeover, but only by paying a subscription. Otherwise it's all a rather stripped down and hobbled shadow of the proper game.
Not that I'm complaining or anything. Free is free after all and if I hadn't played the demo first my opinion might have been different. So by all means have a go, the character creator is certainly fun to muck about with.