What is Reddit's opinion of Mercedes GL ML Class Air Suspension Conversion Kit 4Wheel?

From 3.5 billion Reddit comments

You definitely can convert air suspension to another suspension method, although I am also not sure about how that is on this particular model. Plus, OP said that was one of the reasons they were interested in it, although I guess they could always convert it ~~if~~ when they ever ran into trouble with it.

Anyways, I did find this one here on Amazon. I can't speak to the quality at all, but they do exist. There were a few on other, auto-focused sites but they were all significantly more expensive (in the $1k range).