I like 4003's. I love the tone , and i view them as essentially a one trick pony, BUT, in a good way. You can get multi tricks out of the one trick, the sound is decently versatile, and the treble controls make a big difference, but i love rolling the treble down a little, having mostly a bassy tone with a little treble bite. I go to my local shop weekly to play a 4003 there (they have two, a fireglo and a jetglo, i like the jetglo but man the fireglo is pretty..so i play that one a lot).
I kind of view the Rick in the same category as a precision bass. I know many would disagree with me, but basically for my uses, they fall near each other. I dont really like the slap tone on either, yet i love the fingerstyle tones. The 4003 kinda sounds like a precision as well, except a little smoother, less punchy, but with more bite. If it werent for slapping, id love to own a 4003, but i dont see a rick being used in my funk band at all.
I love them for what they , but they are what they are.
(and damn i love the fingerboards, so pretty)