I just realized I never updated this thread. Oops!
I got the new cot. KingCamp. It packs slightly larger in diameter but is about the same length. The cot itself is the same size when set up.
Right out of the bag, this seems like a higher quality cot.
The legs are MUCH easier to install and tension. There are no loose poles or plastic ends to fall off while you are working with it. You don't have to kneel or stand on it to hold the long rods still while you install the legs.
You simply unfold the leg assemblies which are held together by bungee cord inside, and then snap the plastic ends onto the long rods that run down each side. Then you use one of the feet as a lever to pull it into tension until is clicks.
To detach, you take tension off, pull up on a release, and unsnap it from the sides.
The first cot was hard to assemble inside my small tent. You really need a clean, dry, flat place to assemble it. Yeah, good luck. It was straining my back as well, bowing those rods.
The new one can be put together edgeways if I want. I don't have to get on top of it. No straining my back, either.
Both are comfortable to sleep on. However, I have not spent the night on the new one yet.