Porta Potties - What Kind?

[idaho]

I want to purchase a Porta Potty for our 8.0 for when we camp with no "facilities".  What kind (brand/model) do you guys have?  Do you like it? 

[sandyu]

I have a Coleman type I bought at Walmart. It sits a little low, but takes up less space when traveling. We stopped using the flush pump on it. It just didn't work that well and was noisy. We just pour water from a gallon jug when flushing. We only use it for #1s at night.

[catmanriff]

Thetford. 550p is probably more like a home toilet.