Question for you experienced Boondocker folks

[Ozz]

For those of you with Macerators, and which do you recommend, do you think they are necessary, do you recommend them and why?
I think I have an idea, but it seems you would run out of water around the time you need to dump.. but I just don't know.
I need to get information, so I know whether to budget for one.

I have seen Marine Macerators and they seem cheaper. Why would that be? Are they better.. less powerful?????
I guess they have to be placed lower than the dump outlet, so it seems that takes a permanent mount out of the picture???
Thanks a bunch for the help.