Used Car Ex. Warranty?

I am looking to buy a used car with an extended warranty. The used dealership offers the same warranty as the car's (Land Rover) dealership. Except for the used dealership sells the warranty for $700 less. Is it unwise to get the warranty from the used dealership? I have no experience with buying from a used dealership, and am not sure if there are things I need to be aware of. I know used dealerships tend to be shady and dishonest- Anyone have any recommendations of the warranty from the used dealer is just as good?