David Dicks and his speakers came out of there smelling like yesterdays' diapers.

I've heard his 2.5 cabinet with Fostex FE206E and it only sounded decent (although the driver was not broken in). Panels needed more bracing, bass was somewhat boomy and not extended (as you would expect from a single 8 inch driver with a low Qt of 0.18).

Others have called the FE206E sound "cartoonish".

But I also found a guy who has a Lowther based 2.5 that loves it (after futzing with set up issues).

BTW, there are several single driver speaker professional reviews around. Four have been done for The Horn. Several more for Lothx and Omega speakers. And of course different several for Lowther based cabinet designs.