I trying to find out with would be better to go with. I currenty use a kr808 but not happy with it. I somewhat know more about the 510 or the ego. But does one have any better than the others? I know the ego has a lot bigger battery. I was thinking of picking one up a 510 from mypvshop, has anyone have some feedback on them. Or I was looking into a ego for $50 on the classifieds area?