Aerial sw12

Whats up with this sub. I've seen alot for sale. Good, bad ?
As a owner of this fine sub, I am always looking for a second one, at a bargin. I recall only seeing one or two for sale in the last couple of months. It's a great sub and it's also expensive. If I could find another, at the right price, I would not hesitate to buy it.
I did own a aerial sw12, although it was very good musicly, It would constantly bottom out on ht, expecially dts dvd's, it has a severe popping problem when it bottoms out, I sold it because of that problem, I think you will be hearing more and more about this as more of them are sold, it is definitly too much money for a sub that has that kind of problems.