Just want to share. I know BO option doesn't give you immediate payment but I am switching all of my higher value listings from BIN to BO. The reason is I just had a problematic buyer.
They BIN-ed one of my items on Sunday, and immediately sent me a message to ask me for a delivery upgrade because it was a birthday present and had to get it by Wed. I researched and told them the extra will be £x. Messaged them Sunday evening, Monday morning, Morning lunch time asking them to pay the extra. No response, no payment. Because we are actually in the same city, I posted it via 1st class recorded Monday just before post office closed. Today, they messaged me claiming they still haven't got it and they just checked tracking that they couldn't get it until Friday. The item was of no use for them and they wanted a refund. I went to the Royal Mail online tracking and tracking says they attempted to deliver it twice yesterday and they weren't in and a card had been left. I took screenshots of the tracking info and sent it back to them. Pointed out that if they were not in yesterday to take a 1st class delivery, how were they expect to be in for any delivery even if I upgraded? And they wanted me to refund them before I even get the item back? WTF? I have already preemptively reported them for demanding changing of delivery method and in the details stating their lies. We shall see.
So I checked out their feedback, they left fair amount of negs for others and had I seen their feedback history before hand, I would have blocked them before they bought it. They are blocked now of course.