I upgraded to the ProSub 200TL from an old Klipsch KSW-50 about a month ago and the difference is night and day. Of course, considering what I was upgrading from it was pretty easy for the DefTech.
I listened to the ProSub 100TL, a couple of Mirages, and an Infinity and had decided to get the 100TL, but they were out of stock so they gave me a sweet deal on the 200TL.
I use it mainly for home theater and live in an apartment so I wasn't looking for something to crack plaster... just fill in the lows and it does a great job. I'm very happy with it so far.