Well, my independent mechanic says he tells his customers not to buy anything these days from Chrysler, so I guess based on that I would.
I have purchased extended warranties on used cars, from the manufacturer, and they always seem to know which components are going to fail and exclude them from the extended warranty. Water pump on one car, heater core on another. My last two used car purchases I got an extended warranty, and it was a waste of money on both. 2006 Taurus, no repairs yet.
2007 Taurus, fuel pump went out, but there was a "program" in place from Ford because of fuel pump failures, so repair was free under the original warranty, so that warranty was a waste of money.
You play the odds with warranties, manufacturers would go out of business if they didn't charge more than they would likely ever have to pay out in claims. I'd just bank the $900 just in case there are problems.