Nothing yet!
I bought this to replace the piece of junk 1995 Chrysler Cirrus just donated to charity (see my posting.."I was a dope...").
The Prizm is the same car as a Toyota Corolla, except with the Chevy name tag and a lower market value. I admit we have only had it for 3 weeks, but so far feel this may be a real sweet little car.
Not much in terms of excitement or power. But the car runs great, is very comfortable, easy to drive, and gets excellent MPG.
Everything works perfectly. For 112000 miles, it appears to have been well cared for. Oil was clean when we bought it and brakes were good. I had the trans serviced and bought two new front tires for safe measure. My college aged daughter drives it, and she loves it.
Update for this same car from the original poster. Have had it only 8 months and have already logged in 14,000 miles (126K on it now). My daughter drives the you-know-what out of it! Unfortunately we just had our first fairly major problem which was electrical. There was a short in the wiring and both the daytime driving light module and radiator fan switch were shot. They also said the alternator wasn't putting out like it should. One week later, engine light went on, but I opened air filter and sprayed a very dirty MAF sensor with electric parts cleaner. No more engine light. Most postings for this car are positive, so we're crossing our fingers.