Vifa Drivers and Tweeter

Hi, I just built these speakers

http://users.ece.gatech.edu/~mleach/labsp2/

and I was wondering if anyone had any opinions on the vifa drivers or if anyone has built these speakers. I'm just starting to build my own system. I built these for $250 and I think they sound pretty good and at least give me a place to start comparing other speakers. I'm using a Rotel to power these.

The frequency response seems very even to my ears (tainted and all), but I was hoping I could get some feedback about the vifa drivers and what people think of this design.

Thanks,

Marco