Another +1 for Tolga for SB mounts. I wish I'd bought mine from him.
I bought an MX+ from OPT during their post-NEAF sale last year (lack of tax, plus 5% discount seemed to make it too good to pass up. Plus OPT actually had one in stock).
Don't know how that particular sample got through anyone's QA - it certainly failed mine. The MX+ appeared shiny, new and well-packaged. But it would not come close to a good goto over a distance of more than 5 degrees or so (from home) and tracking was abysmal. OPT was no help. After much discussion with SB via their forum, I was about to ship it back when I came across the fact it had been flashed as a MyT, not an MX+. I reflashed as an MX+ and suddenly it performed exactly as it should have from day 1.
So either SB did not QA after flashing, or this was a return from somebody else which was not subsquently QA-ed.
Either way, I would rather have been dealing with somebody like Tolga instead of phone calls to California and other users (genuinely) trying to be helpful on the SB forums.