I used it and disliked it. I can't exactly say why anymore, it was a while ago, but it just felt odd, and confusing.

I did not continue with it. Maybe the documentation was not written "to my tastes". I don't know how "mainstream" it is, but I suppose if it's initial taste has been better, I'd have stuck with it. I suspect there are others in my position, and hence, maybe it didn't take off as well as it could have.??