Originally I was peaking online for a new hardshell case, and found a package deal with an XB-400 for $150. I've poked around online and seen them going in the $450 range, and wondered if this is a steal I should hop on immediately. I haven't played one yet, but I don't know much to begin with about these basses. Can someone just spew out a bunch of information on these that would be good to know beforehand?