Actually, the seller wanted half cash, half BTC. Guess which half was more of a pain for me? The BTC was quick and easy, cost me about $5 in fees since I wanted to send it fast. One test transaction and then the whole amount, done in 1 block confirmation.
The cash… I had to transfer money via ACH (2-3 days) and then call my (no branches) bank to raise my debit cash advance limit. Then I had to drive to a bank and wait in line, then carry an uncomfortably large amount of cash around until I could pay the seller.
If it had been up to me, I would have paid the whole amount in BTC. It also helped that the price has been somewhat stable over the last few days.