There are a few points to make about Dantalion. One, he claims to use Cthulu, a fictional invention of HP Lovecraft, as the power behind his work (it's on his site). Now plenty of people would be quick to say that gods of religions and mystical practices are equally fake, but at least it's somewhat more believable than a character in a book. At least someone actually believes it.
Second, there have been numerous reports made about his services from a number of individuals. This, by itself, doesn't really prove much, especially given the large number of hoax posts on RoR and others to defame competitiors. However, if you look at dantalion's behavior on those sites he also doesn't lend much to his own credibility. The aforementioned trae of trhonline.com has done a pretty good job of documenting some of the truly bizarre emails sent to Trae by Dantalion as well as a progression of site changes to a page on his site that displays some pretty hefty paranoia.
Third, he has engaged in a campaign of slander against Trae and Jens Johanssen (I don't know Jens and frankly I don't even know if he's a real person) before him to slander them and tack their names to a growing list of spellcaster sites as some kind of crazed mastermind ringleader. This campaign is notable for one feature, he never actually proves any of his claims. He peppers it with mini-facts that prove bits and pieces about the spellcasting sites, but never actually ties any of them together or to Trae aside from merely asserting that they are all his. As someone who has known Trae for years before all of this, I can say that the only actual relation he has to any of those sites is that he has debunked a few and thinks every last one is a scam.
Finally, there is currently a campaign on Paypal to get refunds from Dantalion for services not rendered (see the RoR's for details). The jury is certainly still out on it, but you can't file a claim on paypal against someone if you never paid them through paypal. This suggests, at the very least, that all the claimants were or are customers of Dantalion. Unlike RoR or this site, that's verifiable. It doesn't demonstrate necessarily that they were actually wronged or that they will succeed in getting their money back.
Now, this really doesn't prove that dantalion isn't effective. But it certainly begs the question of some of his ethical practices and his paranoid view of the spellcasting and anti-spellcasting world. I hope it works for you R. But given the behavior I've seen from Dantalion and given some of the faux-magical info on his website, I'm guessing it won't pan out. Again, I realize many people don't believe any of these things work. But even if you do, Dantalion's claims are particularly unbelievable.
And Jumping, simmer the rhetoric. It's doing you no favors. I appreciate what you have done on these cases, but your tone and tactics are problematic at best.