The SR400 designation has belonged to many instruments over the years, passive basses, active basses, flattop bodies, archtops. Are you talking about buying new or used? If used what year?
My first bass was a Y2K SR400 in black, and it's still alive today despite abuse and extensive modifications. It's Korean made and is a very good piece of gear. The neck is fast and easy to play, and likewise is a great instrument. It takes B-E-A-D tuning fairly well, though I would recommend lighter gauge strings.
My needs have changed over the years, and next to a vintage Fender Precision and a modern Jazz bass, the SR400 still gets played regularly.