I've used several different stands ranging from the good ole' pallet nailed to a tree to a couple of Strongbuilt ladder stands. They've all served well enough for me to spend all day in the woods.
If I can get a few buddies together, I like the permanent stands built into the tree itself, 15' to 20' is high enough for me. Usually use 2x4's for the whole thing, for me, plywood floors just didn't last long enough. 4' x 4' is nice, lots of room for me and my stuff. Usually used a boat seat pedestal and a swivel seat, with scent free gun oil to make it swivel quietly. I don't bow hunt, so all of my stands have shooting rails on all sides.
Lately, I've moved to the commercial ladder stands for permanent stands. The convenience of pre-assembling is the biggest benefit. I've got a Strongbuilt basic 15' with a rail, it's pretty portable as it only weighs 50 lbs, so if the need to move it arises, myself and a friend can move it easily. Got to have a cushion though, as the seat is steel mesh. It was easy to "fireman" this one. My other one is a 20' Strongbuilt Bruin. It is really sweet, thick seat, thick back rest, swiveling rail, and built like a tank. You don't move this one unless you have to. It was a "bear" to put up, there were only two of us, and I didn't know if we were going to make it. Got both of them at the pre-season sale at Bass Pro, $50 for the 15' and $130 for the 20'. I couldn't decide which one to get, then my lovely wife chimes in with "Well, if you buy both of them, it's still cheaper than the regular price on the 20'. She's a pretty smart cookie!
I just bought a 17' Hunter Extreme (I think that's the name) on clearance at a local store for $50, it looks nice too, same features as the Strongbuilt Bruin, just a little shorter. Got to figure out where to put this one.
I've got one climber, called the Condor Lite, can't remember who made it. Bought it at Wal-mart a couple of years ago. It's lite enough at 21lbs, pretty comfortable too. Biggest problem is that the forks are pretty narrow, so it can be hard to find the right tree. It's got a shooting rail too. I'm looking for a different one, just to be able to have a better selection of trees to use. Probably something made by Summit, most of their stands seem perfect for me.