1) Good is subjective to the user - that said...
2) No problems when pitched correctly, the tarp that comes with is enough to keep you dry, but if you want more room under it to store gear/cook etc you'll want a larger tarp.
3) Comfortable, again subjective. I tried it for a couple outtings, wasn't overly wowed with it, but not turned off either. You will get cold faster with the wind under you.
4) Ease of setup is phenomenal. Really it's one saving grace IMO. No need to look for a good spot, just two trees 14-15' apart.
Kelty's Noahs tarp is just that - a cat cut tarp, no bug netting etc. The Gunnison's a small one man non-freestanding, and the T-line's a heavy A frame, and the M-Pass is a vested dome.
You've got (by my count)5 very different shelters listed.
You need to ask yourself: what am I using this for, when am I going to use it (time of year), where will I be using it (above/below treeline), does it need to be freestanding, will I need to use it like a bunker if all else fails? How much tent do I want to carry with me?
It's very easy to end up with a tent that almost does what you want it too...