This is my second Liberty, I bought my first one in 2004, (the window regulator wasn't an issue in that model). I love the Liberty for its carlike/suv appearance and towing capabilities. I am averaging 20-21+ mpg in combined city/highway driving. I bought the 2007 knowing that the window regulators were crap. However, it was still under factory warranty and I received such a good deal since it was a manufactures buyback that the savings made it worth the risk/hassle.
Fun to drive, easy to park. Towing a trailer is very easy. My 3" lift really changed the looks. This is a great daily commuter that be taken to the Ritz or to the outback!
Window regulators, if you don't have the resources to fix them buy a roll of duct tape to keep the windows up you'll need it. All add-ons from Mopar/Chrysler seem to start in around the $200 range.