In my short time with the Ego, I've been using the mega atty and carts...one has been leaking some, not sure if I overfilled it or what. Probably user error. But I like them and they hold a lot of juice. Got my tank atty and cart today and after a brief bumpy start with getting the cart hole punctured right I'm liking it a lot too! Think I'll continue to use both but I bet the tank takes precedence and I pick up a couple more of them, we'll see.