I have a pair of Pro four π's as well as the sevens, and I like them a lot. I've always been fond of the Pro four π's. Another great sounding setup is to put the midhorn on top, essentially using the four π as the bass bin and having the mid and tweeter setup of the seven π.I also have a pair of tower two π's and I love them. I find myself listening to them a lot. When I developed the midhorns and was testing them, one of the last things I tried, an afterthought really, was to mount the Alpha 10 from the two π on the midhorn and use a large vented rear chamber. The prototype became the eight π, and I love that speaker too. I'm having a pair of those built in a special two-tone retro finish, hoping to have them done maybe by late summer. I keep the wood shop busy making 12π's right now, so the eight π's are on the back burner, but I'll definitely have them ready by GPAF 2007.