I bought my 20's as 1 year old demo's from my dealer, and he bought a set of 30's. The new line of amps he was selling didn't seem to be able to run the 30's properly, so he called me 2 years later and asked if I wanted to upgrade to the 30's for a decent price, and he would take the 20's back.
I was all over that deal, it took us 4 hours to get the 30's set up for the room, 13 feet x by 21 feet. But they are perfect. I was content to keep the 20's as my end game speaker, but I could not pass up on this deal. I am glad I did, the bass shakes my house now.