I've got the full calmini 3" lift kit. It was actually installed when I got the truck. The only problem I've had with the kit is some contact between the upper control arms and the shocks. That was only after I switched from the thinner Calmini shocks to some thicker ProComps. I did just switch out the calmini add-a-leaves for some Darlington Spring upgrades, which I would definitely recommend.
The heavy duty torsion bars will be nice when I add a winch and bumper. For just a lift, stock t-bars should be fine.

Bottom line is that if I had to do it from the beginning, I would got with Darlington or Independent. They're a simpler install for the same result.

edit/
The main differences are:
-the Calmini comes with new A-arms to correct wheel camber - The other kits use ball joint spacer & flip = same result

-The calmini comes with a new center cross member, which is not really necessary and gets in the way of oil changes.

-Calmini comes with the heavy duty t-bars, which are optional (I beleive) from the others. Only needed if your going to be adding weight up front.

HIH
Andre