Let me see if I can clear everything up here..
1. I know Justin and he has extensive gas tuning experience. If you're on DF, you'll notice that he did a how to on writing tunes over at DF before he purchased tunes from Rob.
2. Justin is a stand up guy and would NOT steal intellectual property, he is very respectful of it.
3. Rob is a great tuner as well, I run his tunes on my truck personally.
4. I have quite a few friends locally that are running Justin's tuning and they are all VERY happy with it.
5. Justin and that 4x4 guy are not the same guy, the 4x4 guy has been sending me messages on DF the last few days from a post I made over there. Any mod could pull his IP address and verify that he's no in the same area even. (Florida and Colorado)
6. You guys talk about his reputation, but you'll notice you can't find one person with a bad thing to say about his tuning. Everybody started out somewhere and just because he's not as well known as Rob doesn't make him a bad tuner. He's still building his customer base and reputation.
7. Since Justin is not a paying vendor on these sites, he obviously wouldn't have a huge reputation on them in only a matter of a few months.
OP...
You will be happy with either Justin or Rob's tuning. If you wan't to get Rob's tuning, I can get you Rob's contact info and he'd be more then happy to sell it to your directly. Then you could pay Dallas to pull your stock tune and then flash the new tune on your truck.
If you want references you should post on DF to see who's running his tunes and happy with it. Additionally you could ask Justin 2009RavenR1 for references and I'm sure he can give you a few guys user names to contact for feedback on his customer service, tunes, etc...
I want to again say that Rob is a great tuner and is one of the best known Dmax tuners in the country.
As for the fact that Dallas no longer carries Rob's tunes... You shouldn't hold that against Justin, but maybe ask Dallas for more details as to why he changed.