The last 2 vehicles we have purchased, were from CarMax, and we got the extended Warranty on both, and it saved us a bunch of cash.
The Astro van actually got two new transmissions on it. 3 power window motors, and 1 U joint.
The Tahoe got a window motor, AC, and something else, can't remember what, but anyhow well worth it.
I would definitely purchase another vehicle from them, and get eh extended warranty.
The AC went out in the Tahoe again this past summer, luckily my wonderful H is handy, and there are U tube videos for everything. He ordered the parts on line, and fixed it, then took it to the shop to get charged up something that would have been something we couldn't afford only cost us $195.00.