I have the extra wide version of the slumberjack and have used it for 6 years now and this thing is a tank. It's a bit of a work out to set up, but I've slept in it for eight weekends at a stretch and on overnight camp trips and it is just effing amazing. The extra large has like a 350 pound weight limit, so unless you're fatty mcfatterson, you could probably get laid on the thing and it'd take it.
The legs are sturdy square aluminum (I want to say inch or inch and a half square aluminum), and the cot unfolds sort of like an accordian. Head and foot struts use plastic tabs in the frame to pop into the cross beams. They chew up but so far I haven't had to try to replace them.
The under-sling is great, and extends 2/3 of the way down, so you can still throw a bag under your feet. The sling has lots of room, and each side of the sling lip has 2 or 3 moderately deep pockets for storing small stuff.
Pair it with a bivy tent and you have a one-man rather compact car camping solution. Cabelas has a 50 dollar bivy tent that will fit this baby just fine if I'm not mistaken.
If you have the extra wide cot like me (39 inches instead of 32... I like my elbow room dammit), then the best bivy tent I've seen is the Teton Sport Outfitter XXL Quick Tent (which if it only weighed 3 pounds less would be my go-to backpacking tent too... *sigh*)
Note: Like most cots, the fabric stretches a little as you sleep in it. It'll develop a small sag in the morning, yet be drum-tight when you first set it up. Six years and it still does that. I find a little bit of sag though is actually more comfortable than the drum-tight cot.
Summary: If you need a cot for guests, sleeping, or car camping, it doesn't get much better than this, and I've eaten through a lot of cots in my time.