I have used DCTV for my last 2 Disney World trips and I will use them again in the future. First trip booked with Joe, second with Kathryn.
I can't say there's anything I dislike about them. I do like the resort and restaurant recommendations that were made to fit my budget, I like that I was told no amount of questions were too many because they wanted me to be comfortable with my vacation. I like that I am replied to in a timely manner with no details left out.
I also like using a Canadian agent because that's important to me - keep the money within our own economy (even through she works for a U.S. company, I won't hold that against her, she gets her commission from my trip and we're all happy...) It was a bonus when she joined DCTV last year, I was assigned as a client to her because of geography.
I had originally requested quotes from about 4 or 5 online Disney TA's back in 2004. They pretty much all came back the same price for what I asked for. I went with DCTV because they responded with the most detailed answers to my questions in the first email.