I just bought the Thetford Curve (because the price had dropped significantly on Amazon). I Haven't used it yet, but plan to for my boondock next week. In the past, I used the bucket and toilet seat/cat litter method, both times, I erected a shower tent/outhouse next to the camper because I really don't want to pee in front of my grown up kids, or vice versa. I'm glad I finally bit the bullet and got this. I'm doing more primitive camping these days and it makes things less complicated.