Hi Dave,
I own an SA450 and it's a superb amp. Warm, full sounding... I play an old Fender P bass, a couple of hollowbodies and Lakland jazz basses and they all sound warm, fat and natural through this amp.
I used to use an LMII as well and that was a very warm sounding amp. The LMIII will be the same but improved!
All the best,
Steve