Black Tooth - I have nothing to gain or lose by suggesting DJ to the OP. You, on the other hand, sound like a competitor of his. You don't know where his shop is, don't know that he owns a Mustang dyno, and don't know about his staff. So upon what do you base your opinions?
I based my opinion of Joe on what I observed. And having done this for 25 years and knowing more than most of the punks (generally speaking, not anyone in particular) on any given internet forum combined, my opinion is based on fact and experience.
Based on MY experience with Joe so far, here is what I have observed first hand:
The shop is very clean and professional looking;
The dyno, dyno electronics, and dyno computer are well maintained;
I arrived on time and, despite other cars needing attention, Joe had my car on the dyno on time;
Joe invited questions and comments about what I wanted, and allowed me to observe the dyno runs;
Joe sat down with me and looked at the readouts, including a/f readings, asked for my input, and explained what he was shooting for and what remained to be done;
I watched Joe methodically chase down an a/f ratio problem using sound reasoning and methods, which ultimately fixed the issue;
Joe spent extra time and worked late with my car because I (not he) decided to tweak a few more things on the a/f ratio.
All I can say is that based on MY EXPERIENCE with Dyno Joe, I am pleased with the customer service and the tuning results. I can understand that not everyone will have the same opinion. In fact, there's not a tuner in this city who doesn't have a ton of former, pissed off customers. MTI, Slaters, Strictly, PSI - I've heard horror stories about all of them. It's part of the game and we all know that. I went to Joe because the shop I'd been using for 5 years doesn't know how to return calls or install gears without gear whine. But I'm not going to talk trash about them on the internet all day because I'm mad.
If you don't like Joe because of your first hand experience, fine. My experience is otherwise as stated above. And I'm very happy with Joe unless my experience changes. I know much more than the average person about hotrodding, and I am very critical of how most people handle my cars. I've not seen anything with Joe that set off any alarms in my head. Perhaps things have changed since you knew him.