Good price.
There are idiosyncracies with the 4003, many well-documented here, that either turn you off or you learn to accept and live with them.
I never considered myself an expert luthier, but I'm pretty sharp with basic set ups on a wide variety of basses and guitars. I do not find the stock Ric bridge that difficult to set up to taste. The only real problem I ever had was with the older black powder coated variety that had some tail lift. The lift settled and the bass set up, intonated, tuned up, and stayed stable as the day is long, but it still bugged me, so I put the Hipshot replacement on it. That bridge has some idiosyncracies of its own with saddles rocking if you don't do it right, so it's only a marginal improvement. Tail lift is a relatively rare thing, and if this bass is more than a few years old and hasn't experienced it, it's probably not going to happen.
I found the ergonomics a little odd at first, and if you thumb anchor, thumb placement can take a little adjustment. I hunkered down over my first Ric for a good long time before buying it, and I decided I could acclimate to the bass. Best gear decision I ever made.
Dual rods take a little extra thought, but once you get the hang of it, it's a great design. You can actually get one relief for the bottom string and a slightly different relief for the top string which contributes to a whole lot of stability and accuracy. Again, not that hard IMHO.
That neck PU cover had to go, a common mod for Ric players.
Once my 4003's are set up, they tend to have the lowest action in my collection, be among my easier players, and they stay stable for years without needing so much as a tweak. If you need help there are tons of videos. If you rely on a tech, make sure you have a RIC EXPERIENCED tech.
Some of the above is a deal breaker for some bass players, and that's fair. I play a wide variety of brands and configurations, and I wouldn't be without at least one 4003 in my arsenal.