I have the iBall. It works OK, I like the fact I can switch it between our truck and Suburban really quick w/o having to buy 2 of them. I've got the bracket set up so that it will work for both vehicles w/o moving it. I've had it about a year and a half. No problems with it. I did think the screen was starting to go bad, but it turns out just needed a new battery in the camera. Their tech support responded quickly with the correct fix. Can't argue with that. Once in awhile I get interference and the screen will go fuzzy for a second, but usually not to bad or more than a second or two. Sometimes in can be a pain to have to get it out and place it at the rear of the truck and then get back in the truck. The other thing is, you probably don't want to forget the iBall back there as it may not be there when you get to your destination. I haven't forgotten mine yet, but almost did a couple of times.
Is it as good as a dedicated hard-wired unit? Probably not, but for my older truck and SUV that didn't have one, hard to beat. I think I got mine for something like $89 shipped.
1999 Silverado 1500 ECSB 4x4 5.3/3.73s
2009 Jayco 32BHDS