Hi all. A Mesa Boogie Bass 400 + has come up for sale on the local CL. I'm certainly intrigued, but I have a couple of questions that I was hoping the TB community could help me with. 1.What's the difference between a 400 and a 400 +? 2. How do these measure up as compared to an SVT CL or a Fender Bassman 300 Pro, or basically any of the other high powered all tube heads? 3. How's the reliability on these, retubing costs etc? I'm currently using a Traynor TC 810 in the rehearsal space and a TC electronics 112 at home, and bringing a shuttle 6.0 back and forth for home practice and rehearsals/gigs. The idea was to get a dedicated head to use with the 810 that would be able to drive a second 810 if needed. Would the 400+ be up to the task? Does anyone think the 400+ would work better on top of an 810 than a genz shuttle 6?