i have heard both.
several people at advrider.com have them, and they seam to like them.
it just looks like it puts a lot of stress on the hitch.
i have a small truck that works fine.
a friend of mine just got a fold up trailer and he really likes it.
....just did a web search they are $1700...too much for me.
tractor supply has a nice 4X8 but then those are about $800.