I started the same kind of poll a couple of months ago on another Jeep forum.
The results so far indicate about 10 - 18% of the people responding have had issues. 48 folks have had no issues, 3 have had warning lights but the QL system still works, and 6 have had actual problems that required a trip to the dealership. However there are about 3 - 5 people who've reported problems but haven't voted in the poll yet.
And that is not a very good percentage this early on.
In fact, its these issues that have caused me to delay my purchase until the 2012 models roll out. Hopefully, Jeep will learn how to make the JGC in general and the QL in particular more reliable.