It seems others have covered this all pretty well. As a real estate broker in Durham, I encourage all my sellers to offer a warranty & all my buyers to request one. It helps take a little of the stress out of buying a resale home. I use 2-10 Home Warranty Co., they cover more & have fewer exclusions it seems than AHS, & around $400 is about right for warranties bought at closing. (may be more otherwise???) Like Cathy said, I wouldn't get one just to have one, but if your big ticket items are near their end & you have kept them maintained, it might pay for itself quickly. My biggest problem is the contractor issue... I'd rather use my own. Also, keep in mind that the Trade Fee (what you pay the contractor for the trip out) varies from around $50-90. My advice here would be to inquire of the Warranty Company of who is on there call list, especially for HVAC, electrical, & plumbing, and then do some checking into them. Also, shop the warranties themselves & read those terms.
-Son of Jarhead
The Duke fan formerly known as BuschDevil