I went through a phase where I was 100% dedicated to ground hunting. (until I got a Lone Wolf Climber, now I'm 50/50 ground versus up a tree. But thats another subject all together)
I've tried the three-legged tripods, all types that you hang off the side of the tree, Waldrop Pac Seat, etc, etc, etc.
The search for the perfect seat seemed like it was going on forever. Until I came to the realization, that every situation can not be covered by a single seat.
After coming to that realization, my seats have been narrowed down to two. The rest, thrown in the trash or given away... The Waldrop PacSeat and the Nif-T-Seat.
Waldrop PacSeat:
Pros:
Super Comfortable. Can sit all day for 8 hours if needed. Be careful, you may be woken from your accidental slumber by a deer in your wheel-house!
Relatively Light.
Quiet for the first couple years.
Lean against a tree or Stand Alone.
Low Profile.
No set up time. Drop it off your back and you're hunting.
Cons:
Got a little squeeky after the first couple seasons. I have to lube it up before each season.
I have found set ups where this seat didn't work out. On extreme inclined hills, sometimes this seat just can't sit true, or if you get into a bulbus root system, the support bar between the front two legs teaters on the root system. Rarely, but it does happen, sometime the terrain forces you to compromise the "perfect" set up for a more Waldrop appropriate setup.
Can't rotate into a shot if needed without sliding your butt on the seat surface.
Nylon seat webbing is sometime really slick if I'm wearing clothes that don't grab well. (slide/creep down and have to push yourself back up the seat)
Nif-T-Seat:
Pros:
Super Rugged Construction. My grandkids will be using this seat decades from now.
Extremely adjustable.
Super Light.
No situation or terrain that this seat can not work in.
Packable, extremely minimalist concept.
Cool belt loop hook carry system.
Rotates naturally with it's design, but no moving parts to get squeeky in a hokey "swivel system". Great at the moment of truth when you need that extra 5º of angle to rotate into the shot.
Cons:
Not for extended sits over 3 to 4 hours.
Minimal set up time. You do have a little assembly required, but not much.
These two seat cover every scenario I have when I'm hunting.
If I am hunting terrible terrain, not sitting over 4 hours, heavy slopes, and not 100% sure of where that "perfect" set up is, or simply spot and stalk hunting, the Nif-T-Seat will be with me on my journey.
If I know where I am setting up, the terrain isn't extreme, and i'm sitting for more than 4 hours, the Waldrop is on my back.
There are blended scenarios that make me sit at the back of my car before I walk in, staring at my two seats, each of which is screaming "pick me! pick me!"... Either way though, both are the most high quality, highly versitile seat on the market in my opinion. Very little restriction on usage, and perfect for years and years of abuse in the woods.
At the end of the day, if someone made me pick just one seat to hunt from for the rest of my days, I'd probably pick the Nif-T-Seat. At my young age, versitility to be able to see that perfect set up and get set up without any compromises out weighs comfort at the moment, and I love knowing I can head in the woods with my minimalist seat strapped to my belt, and get into any ambush that jumps out at me.
In 20 years, when my back can't take 4 hours on the Nif-T-Seat, the Waldrop will probably move to #1.
Hypothetically though, out of 10 hunts on the ground, I probably use the Nif-T-Seat 6 or 7 out of 10 times. So they both get to see a lot of action and rotation in my line-up.
Hope that helped a little.