Mine's a keeper - I love the string tension, the light weight, the spread of sounds with just a passive four-way switch and a tone control, and I switch between mine and my regular 34" basses all the time and never notice.
The only time I notice the frets is if I'm doing a lot of work down the first three frets (that nut-to-first-fret on the E is a loong way ) or if I'm right up in the nosebleed frets - 15 and up for me. If you do a lot of chordal stuff over fret 15 you might have to readjust your technique a little, but otherwise it's all positive for me.
I only play a 4, I'd imagine the 5s make even more sense - I've played a Dingwall 5, and the B was fantastic, but 5s aren't for me.
The build quality is second to none, I've never had to go anywhere near the truss rod (and I'm a fiddler) and the attention to detail is superb.
Oh, and Sheldon Dingwall is a gent who has given me some top quality customer service in the past (there's a thread on here about it somewhere).
If you can get down to Bass Direct, Mark has the largest collection in the world, and if you don't like them after a visit there, you never will.
Was that a bit gushy?