As a former Turner Ren owner and a current Turner Electroline fretless 5 owner my feelings are that Rick (in addition to being on my Mount Rushmore of Lutherie) has a great sense of design. The word that comes to my mind is "italianate", with the harmony of curves and the way the visual weight is distributed. Great stuff. Opinions about the aesthetic are fine in either direction since that is how the world works, nothing works for everyone.
Aside from the looks, my Ren had a freakish amount of sustain, tonal response to technique that surpasses any bass I have ever played, and it held up in everything from acoustic folk sets to very loud power rock. I'll own one again, but my other Turner is doing just fine by me so far.
Aside from owning his instruments, both bought used, I've talked to Rick on the phone and by email and he has proven to be a great luthier to deal with, but I have nothing to gain from chiming in here other than knowing that I spoke my mind.
Pete