Yeah, if you have someone/anyone that might put the rig in any 4wd mode, with hubs unlocked, probably not a good idea to get them.

I have to admit, I'm not exactly sure what is gained by installing them. I didn't do any measurements after installing mine. The 1 thing I did notice was the steering seem to be easier/looser/freer (take your pick) with hubs unlocked. I believe what happens is 1 axle is disconnected with hubs unlocked. I didn't take that as a bad thing.