anyone have experience with the ryobi screwdriver (4v)? It seems like a decent tool but I wonder how long the motor would last, it seems to strain a little more than I like under load. I'm trying to decide whether to keep that one or the hitachi. The hitachi is nice, but the chuck seems pretty crappy. Bits fit loose in it. Other than that, seems like a good driver for light work. Anyone have a rec between these two?