My 14 year-old helped me build the Fusion-6 by Matt Grant http://www.diysoundgroup.com/waveguide-speaker-kits/fusion-6.html
They sound great -- dynamic and natural. They do not have pants-flapping bass, but they sound plenty big and they can play loud without strain.
The biggest lesson we learned is that finishing speakers takes skill and patience, especially when doing things the hard way, which looks deceptively like the easy way. It's presentable, especially for a bedroom system on bookshelves, but if I were to do it again I would work harder (and smarter) on the paint job.
Anyway, we are really happy with the sound. This was a fun project.
The response graph was made by averaging three mic positions in a two-foot arc around the listening position from 8 ft. away.