I am considering a trip to Poland in May. On my previous trips to Germany, the Czech Republic, and France I have always rented a car so that I could get off the beaten path. Also, I feel like its less expensive in the long run since 3 of us always travel together. No problems on these previous trips with the car or driving. We take a GPS.
I haven't driven in Poland, so I would be interested in info from those who have.