would you allow escrow?
I would if I had this unit, but for Pre-Ordering, No.
Reason why is:
Risk is up to the buyer, if BFL decides to not deliver, delivers extremely late or is a scam. (Past delivered 60 GH, 832 Mhash units so its very unlikely)
Escrow would force a return of coins on my part if this does occur.
Unless you can agree to guaranteed BTC transfer by XXX date regardless if BFL delivers or not or is a scam.
The moment I receive the unit I would ship it within 1 day of getting it.
Do note a buyer buying on BFL can be entitled to the same risk.
Only difference here is you get the BFL unit at a discount pricing.
So better then buying directly from BFL.