I don't have a 5th gen but have run Camburg, Sway Away, and Icon on various years tacomas and 4runners over the years as well as many other lift components.
Camburg and Sway Away were both cheap to rebuild compared to the Icon rebuild kits. Couple that with Icon's fill adapter that requires a special $35 adapter and a competent shop with the equipment that is willing to fill with Icon's adapter and the "convenience" of having a rebuildable shock quickly go away.
That being said, the Donahoe/Icon shocks I have now are in MUCH better shape than any of the Camburg/Sway away shocks I've seen and are MUCH older. Icon figured out a way to keep them from rusting and I give them kudos for that!
In my opinion the Icons (and others) don't ride significantly better than a conventional HIGH QUALITY strut/spring set-up. On my 3rd gen 4runner I think I actually prefer the street/DD qualities of the Tundra Bilstein and TRD tundra springs over my Icons. That also isn't what they were designed for though, they were designed for performance in high speed applications over large rough terrain, the bigger shock is for cooling. If your use doesn't fit their use case I don't think you'll really notice a huge difference over a standard set-up. Other than your wallet being a lot lighter! I think a lot of people expect magic
Parts do wear out, I've replaced all of the spherical bearings, and am about to do a rebuild now on my Icons. To replace all 4 spherical bearings, buy the rebuild kits, buy the fill adapter (which is reusable), shock oil, and pay someone to charge them I'll be in the rebuild for about $200 doing the labor myself.
So, for about the same amount of money and work I could replace my shocks with a conventional shock at the same frequency. I can't speak for frequency of rebuilds yet as I bought these shocks used and have no clue how many miles they had since their last rebuild. You hear people talk about anywhere from 30k miles on up, I can tell you I won't rebuild unless they are leaking and if these things leak after 30k miles on a new rebuild they will be SOLD!
I haven't tried Fox or King yet, but at this point I haven't been satisfied enough with the other ones to buy them again. I'd look at some of Fox's new offerings as they seem to be improving their line of factory replacement shocks and King would be my choice at this point. It is the only brand (other than Icon) that seems to hold up and not rust to crap outside of the desert (for comparison's sake, I live in Georgia so it isn't like we get salted roads or anything, just humidity).