The correct answer is, it depends ...
What sort of music do you play? Are you a tapping & slapping person, a doom-laden Goth monster, a heads-down no-nonsense mindless boogie type, etc.?
The OTB is a truly great head and a perfect match for Barefaced cabs with 12" drivers (IMHO and IME) but it is famously a one-trick pony.
If you like that one trick (and I do, believe me I do) then it's an awesome head.
If not, then you will be eternally frustrated by the total lack of flexibility or EQ, and you will invest your entire pension fund in FX pedals in a desperate attempt to remedy the situation.
Your call ...