I just installed the Ironman Stage 2 kit (foam cell, heavy load front shocks, heavy load rear leaf pack) on my truck over the holidays. Some thoughts and advice I have...
1. Unless you're mildly mechanically inclined, don't do the install yourself. There were some physically demanding/difficult steps, and I powered through, but I think it might be worth the $800-1000 you'd pay for a shop to do it, because it really is a lot of work.
2. Opt for the springs pre-mounted on the front shocks. I didn't do that and I didn't order new spring top hats, so I had to drop my lower control arm to remove my old springs from the old coils so I could re-use the top hats. The new springs were so tight/strong that I couldn't get them on myself via the cheating way (like I did removing the stock set) and had to take them to a shop. I ended up dinging them up a little bit, so I'll have to keep an eye on that paint to see if they rust soon. However, I must stress that you should absolutely not try using those flimsy coil compressors you see at Harbor Freight and auto parts stores. The guys at the shop that mounted my springs were afraid of them and they used the big standard machine. Those heavy load springs are no freaking joke!
3. Remove a leaf or two from the pack. Ironman suggested I remove number 3 and possibly number 5. I like clearance so I only removed the 3rd leaf and kept the rest. I didn't have any extra weight on the truck aside from my camper shell and the fairly light Victory 4x4 racks and I ended up with about 4.125" lift in the front and 4.75-5.125" in the rear. I'm absolutely freaking stoked with how it looks though. Even with the extra height, the bright green springs don't really stick out obnoxiously, which was something I feared and even considered painting them black before install, but now I'm glad I didn't.
I'm not sure how the 0-110 lbs "performance" load springs are. I checked specs on the load ratings and it seems like the heavy load stuff is just a nudge stronger/stiffer than the regular springs, but I figure I'm only going to be adding weight to the truck over its lifespan, not removing anything.
Despite the nearly 15 hours of work (had minimal help from a couple friends throughout the two days), I had a decent experience installing it and I love how my truck looks. I can definitely tell the suspension is stiffer, but I don't mind it. My wife seems to notice as well (though I think I had to point it out to her first, and now she brings it up but I think it's related to her hunger level at the time haha). I haven't hit any trails yet because CO just got hit with snow and my normal trail buddy is out for a back injury, but I'll be putting it to the test soon. See attached for how the truck turned out!
It's worth mentioning that I work with someone that has a 2010 4Runner with the stage 2 kit on it as well, and he has about 30k miles (estimated 5k off pavement) on his and absolutely loves it. With that insanely good deal that Ironman was running for the holidays (approx $2500 for the kit), I'm not sure you can go wrong getting it.