The TBE is a tempering tank. It is not really well suited to film development except that one of the inserts accomodates a developing tank used fro regular inversion processing. Therefore, I don't think it would be useful for more than a roll or two of film for manual processing.
However, it is very useful for tempering solutions that are used in the CPP/CPA processors. I use mine to temper chemicals for use in BTZS tubes for 4x5 sheet film.
I sucked it up and bought one new several years ago but they are quite expensive, even used. A DIY model consists of a platic tub with an aqaurium heater.