I have a 4er and a 5er. Fine basses, do everything it says on the can "TBird", mellow upper register sustain of a neck thru excepted (they are set neck). They compensate with more thud and more focus. Better high register access, better ergonomics (TBird look with P Bass feel when strapped?) than a classic TBird, but not as elegant in look. The Studios are a bit utalitarian in look (and were probably meant to be that way). Some people might like those robust visuals better though.