I ordered my new Phoenix pop up with an inside shower and a cassette toilet and it's one of the best options I added. Since it was a custom camper anyhow, and I am a big guy, I actually ordered the shower/bathroom enclosure oversized. What I DIDN'T know is that Phoenix deletes the outside shower if you order the inside one, so now I am looking at adding one outside. We just spent two weeks in the camper, a lot of that time with no showers available where we were camping, and the moisture inside was sometimes a problem. It would be nice to have the outside option, when adding moisture inside just before bed doesn't sound like a good idea.