I bought a used boat in the same price range as OP from them. It had a Mercury and I was told they fully serviced it. When I took it home and pulled the plug on the gear lube, it was clear it had not been serviced as well as the conditions of the spark plugs. First time out discovered the hot foot was sticking and not retracting also. It was clear the boat was taken on trade, wiped down a little and not much else as far as making sure its fully tuned up despite what I was told.
That being said I'm pretty handy and had it looked over by my normal Merc mechanic and all issues were not a big deal to resolve. However, I would not buy used again from them after this experience. If I was looking for a new Skeeter, their inventory makes it hard to pass up, I would just have motor service done elsewhere. Their sales man is good to deal with and I can't blame their service department on him.