i loved my nova. maintence is really easy. a little oil there and a little oil there. super fast for a semi-auto. runs great on co2. sounds like no other gun out there, people will know who you are out on the field.
one day the gun will have a little air leak and the next day its fine? just make sure you oil all the o-rings (not to much) and make sure their in the right place.
another thing is dont fill your hopper to the top make sure there is some room or you will chop a ball.