I generally don't do installments because in the past it often turned into a pain in the butt for me to track down the buyer for payment.
However, I did give the option recently to some buyers during negotiation on Dan.com and have (2) in process now -
One for $600 a month for (12) months.
One for $750 a month for (12) months.
If Dan.com is going to handle the annoying part, I am fine with that.
I would prefer a buyer had to put more down up front so they had more skin in game, but that is not an option there.
Brad