I spent quite a bit of time looking at this car at SEMA this year. The Ring brothers take a different angle on customizing Mustangs that is a bit outside the standard 17" Torque Thrust II's and lowered springs that are commonplace today. I'd say the mixed reception is similar to the welcome that 'restomodding' received 5-10 year back. They are quite the craftsmen and I think possibly a glimpse of the direction the hobby is headed in.
A few highlights: custom designed billet aluminum hood hinges (these were awesome), carbon fiber tail light panel, completely custom or retrofitted interior (dash, console, door panels). There was also a small high gloss black cover plate riveted to the monte carlo bar that follows the edge of the a/c compressor, just a nice touch.
I always thought the GTR imblems were 'ricey' but the 'R' is for 'Ring'.