We have had a Stay-in-Play on our Ford Escape for almost 4 years and absolutely love it. Flip the switch on the side of our center console to turn it on and that's it.
If you plan to keep the vehicle for some time, it is well worth it. We have never had battery issues (and we do not have a charge line). Once it is installed, you don't even know it's there. I don't have experience with any other system, and quite frankly, don't think I ever will. I highly recommend it.