Haven't been around in awhile while sorting out a new addition to the family, so I'm late to this party, but I figured I'd chime in late since no one that actually owns these has yet.
So, everyone knows you have to recharge the nitrogen every 6 months, but I don't see what the big deal is with that if you're used to doing work on your Jeep anyway. Honestly I think failing to do that is what causes a number of the problems you see people having with them. But personally I don't see a problem with these shocks, for what they are. The question is what they aren't.
To me, the big downside is that you can't custom valve them, and you are stuck with the MC coils and spring rates. So it's a specific segment of the market these are good for.
You want lots of travel? Check.
You want to easily bolt in? Check. Especially when compared with the 14-16" coilovers.
You want to run a light rig with their spring rates? You want to ride fast over whoops on a lower spring rate to keep up with the coilovers while maintaining a heavier second rate also? Maybe not so good. Again related to being stuck with their springs.
You want to customize shock valving? Another limitation.
You've gotta add up what you want to do and count your costs, as with everything.