I prefer a Johny Partner. I empty it at a local out house rental. It takes less than 10 min but the most important part is the handles, they help for carrying ( 2 can carry when it gets heavy ) and they are good to hold to after lasagna nightI have used most and don't think you can beat a Johnny partner by partner steel. The hang up, price. And up here in idaho there is a scat machine readily available on most all rivers. Guides here run Johnny's or riverbank by Segway fab I believe. Those would be my one and two. I might bump the riverbank up to o e if I lived where there where no scat machines as I think they my be easier to clean with the septic hook up. Though I have never used anything except a scat machine.