If you want fool proof piece of mind yes, but if you have seen a great deal from a trusted source and you are comfortable it has not been missused then I cant argue with going for the deal.
This is no different than any other S/H purchase - "Buyer Beware"
On the plus side, you most likely will get a profilux at a good deal.
On the negative side, make sure the unit has not been subjected to high humid conditions or worse salt incursions as both would not be covered under any past present warranty. saying that everything is client repairable though.
ProfiLux dont "JUST" go wrong, this is such a true statement, i have seen a few cases of attempted warranty that when we receive the units the units were either wet or full of salt stains.
if you cant physically see it working then buyer beware really is paramount.