Have you seen the cars? If so did you like the looks of them?Does the asking price seem fair to you?
Any HO car can be improved quite often at little expence if your of a mind to do it.I have quite a few Bachmann,LifeLike,and Tyco cars.Usually the bigest problem is the paint jobs and hornhook couplers.
My advice would be (a) if you like the cars buy them (b) be prepared to spend a little time on them (body mounting couplers and removing the truck mounted ones) (c) be prepared to enjoy your new toys)