Clipless pedals are really good. We have all had that first time experience where we needed to clip out of them and the bike stopped and just like in the movies...in what seems like slow motion one just teeters to the side and falls over....My word of advice would be to practice getting in and out of them...until you got it pretty good...you'll probably fall trying to get out once or twice but soon it will seem like second nature....they really do help in pedaling power.
Seth