We have an old SunMar NE (non-electric) at our cabin. I love not having to go outside to the outhouse. I despise when we have to do a deep clean (i.e., we didn't empty often enough or our "mix" wasn't quite right and the liquid diverter drain clogged.) I can't find an install manual for the mobile so I'm not sure if it has the urine diverter. Ours can develop an odor, but it seems that is only when it isn't being emptied often enough or you have, like in our case, a clog. We have it in an enclosed, attached shed so it isn't a small space space and it is not built very tight so there is air leaks 24/7. We also have an additional large, louvered and screened vent next to it for heavy-use months since ours doesn't have the electric powered vent. It can be messy to clean out, they do not hold a ton so guests may have to take the finishing tray out to dump. They recommend adding peat moss in that needs to be stored and creates a bit of dust when dumped in. All that aside, I do overall recommend them but I'd wait to hear from someone that has used them in a boat or RV. For our off-grid cabin it is just about perfect, but in a tight spot it might not be ideal.