Looking for opinions on ATC Active 10's or 20's...

I auditioned the active 10's the other day at a local shop and was pretty impressed with them. They came across as very neutral and pack a lot of sound into a small package. I was looking for some input from someone else who has heard the active 10's or 20's and perhaps has been living with them for a while. I'd like to know if they are at all fatiguing and how sensitive they are to the listening environment. I'd also like to know if anyone has owned them and sold them, and if so, why.

Thanks in advance