I havent seen the HD80(, HD81-LV, or HD81,) but based on what I have read on its bigger brother, the HD81, I could think of a few. One HUGE one for certain would be brand/product reliability.
Optoma's recent (last several years) products havent been the best QCed, and I would wager most returned/exchanged on these forums. That could have changed with the HD80 and HD81-LV, however I believe that Jeff, or maybe it was Art, or both, had to have a 2nd unit already.
Personally, if I bought an Optoma projector (which at this point I would never do unless there were several months worth of problem free reports on the Optoma threads) it would be EXPECTING to have to deal with takedowns, returns and exchanges.
My setup, still in progress:
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