Used Watterrower too cheap?

Hi all - been reading through the posts and reviews online and found a Waterrower Series4 for $200. It has a very small drip leak when using according to the seller and I've read up on the B7000 glue. Seller's ratings are great, but compared to other listings it's WAY low. I get the leak adds to it and he's dropped the price recently. Any concerns?