To help a little bit (and of course advertise a little I guess), we don't just sell that system, myself and all of the guys who work for me use it as well. I've had mine on my JK for several years and I have absolutely nothing bad to say about it. The install is fairly straight forward, the system has some great features, and theres nothing complex about the controls of it. If your not trying to link batteries or something like that, you'll forget its even there.
If one of your batteries starts getting low, it will beep once every 3-4 seconds to let you know, etc. We've sold quite a few of those systems and I've had nothing but positive feedback from our customers either. Just wanted to throw that out there and maybe that will give you some user insight to the system.
Let us know if we can help you!