dunbar, if the sale is through thybrid, then it's his ass on the line. if you buy it direct from his friend without them making a thread you can't hold thybrid accountable.
I suggest buying it from Thybrid. He just needs to know if it goes sour, he'll be held accountable.
A big thing to keep in mind is the fact Thybrid is a car stereo guy so you'll have half a chance at him caring enough to pad the battery for the trip so it arrives safely.