Hi,
I didn't see anything that would be a particular problem..
There was a clause regarding part payment of the amount owed on the 15 year plan that looked a bid odd. It seemed to imply that there would be some kind of cost to be applied at the seller's "discretion". Anyway, I have been assured that there is no penalty for early payment.
I was pleased to see a penalty clause on the seller for finishing the developement late... although it does have to be late by more that 18 months