I just got a 1073MPF and it is in perfect shape - shipped direct from BAE too. I haven't used it much so far but early impressions are that it sounds incredible, and of course it looks pretty incredible too! I considered a 500 series 1073MPL in part because I recently got a BAE 11-space rack, but I wanted all the controls easily accessible (impedance switch is on the back) and the HPF wasn't an option unless I got the full 3-space 1073D.
Sorry to hear you received a faulty 1073MPL. That experience would make me consider other options as well. The Heritage 500 version is also more feature rich than the BAE 500 version so that doesn't hurt either.