If it's anything like the JBL GTO804, I would scoop them up. The 8" JBL is nothing short of amazing for the price. Digs deep, doesn't require any real power for some serious output and the box is very small when using it sealed.
XXL 10 is a tough act to follow.would 2 of them be better than 1 Peerless XXL 10 ? I got a new Peerless but I have been wanting to fab up a little box with 2 of these 8's