I REALLY like my outdoor shower. My girlfriend who is fussy prefers the outdoor shower to campground showers. A big reason I got my FWC is to improve my comfort during my adventures. I have tented or slept in the back of my truck for the better part of 20 years and I found that I was not as excited to get outdoors anymore.
I am very pleased with my outdoor shower. I use it to shower, do dishes, wash stuff, and wash my dog. It is very convenient. Just activate the pump and water heater and you are off to the races. No messin around. What makes me a little nervous it is just one more thing to winterize and one more thing to go wrong.
Without having used them, I suspect that the other showers which I believe would be more reliable and less prone to breakage and less hassle when they break - might be more cumbersome to get going at the end of a long day - I will leave it to those who use them to comment.
If in a busy campground - which I don't like to be, but sometimes it happens - We wear a swim suit to shower and suffer the wind (BTW my hunting partner says I sound like a wounded grizzly bear when its cold). I prefer to shower right before bed. The great thing about the Outdoor shower is it is all built in ready to go. Just gear down, turn on the furnace, shower, and towel off inside in front of the heater and then straight to bed.
I think about the outdoor shower option often, If it never breaks - It is the ONLY way to go. If it gives me hassles then a NEO or Zodi might be a better bet.
After 100 nights - my vote is for the outdoor shower - I reserve the right to change my opinion at any time!!!