I heard them once. Build quality OK, sound OK but two steps behind Cain & Cain and a step behind The Horns (if positioned correctly, they can be very fussy). Like The Horns they sit very low and so can get lost around furniture. The bottom octave is missing from all three. By the time you add the supertweeter (more necessary as they do sit so low) they become an excercise in fustration (too expensive with the tweeter costing more than the main driver).
I own Bob's speakers, but IMO they are the value leader and Bob is very good to work with. Woodworking is not up to Terry Cain or even Louis from Omega Speakers, but the transmission line bass is much deeper, faster, and more musical. Various kit options makes them the obvious single driver choice if you want bass and can DIY.
Regarding woodworking quality: Most audiophiles want much higher quality in their speakers than they do in the rest of their furniture. IMO Terry Cain's stuff fits in houses that have $100,000 in furnishings and Louis' speakers match up to a house with $40,000 worth of furnishings. Bob's offerings fit in with typical middle income stuff and Ed's with Value City furniture.
