I want to dispel some rumors. I have always been a proponent of ARB's (air locker) but in my new TJ I decided to try a E-locker because I thought it was going to be easier because all you have to do is run a wire as mentioned previously, and as
@Squatch mentioned you have to pull the trigger on something, but the wiring kit that comes with the air locker is way more stiff and bigger than running air lines. Honestly the wire harness is heavy and I plan on running them front and rear so I will have to route two of these. These harness run to switches and relays and circuit breakers. There is actually a lot more than running air lines in my opinion so far. I haven't actually ran the wires yet. I am still in the imagining phase. I mean I have the parts, but my rear end is not installed yet. I am also going to try and convert the switches in my dash to stock like switches which will be somewhat difficult because the harness for the most part is already prewired. I don't have any regrets going with the elockers, but I did think they would be easier, but I think in the long run the ARB's were actually quite easier.
The place that build my rear axle for me this time, said they prefer the ARB because there are parts if necessary and they are easier to obtain., but the eaton parts are quite a bit harder to get, and they don't sell a lot of parts meaning if the locker fails most likely you will be replacing the locker rather than repairing it.
I am not discouraged and plan on putting one in the front as soon as i am done with the rear. But in retrospect, if I had seen the wire harness up front, I probably would have stuck with the ARB, but that said, I haven't heard anything bad about the e-lockers and I am confident I will like them when they are finally in and running. Also the wire harness didn't come with any instructions although most of the wires are labelled.