I used VitaRank for about 6 months before taking a break from running SEO campaigns, these are my .02
These guys are without a doubt, second to none when it comes to customer support. Even now when I'm not a customer of theirs, they still go out of their way to answer questions privately via Skype. They're available almost 24/7 and respond fast, seriously. It's unbelievable
I dont really post here, and I certainly don't go out of my way to review sellers I've used in the past, I'm that guy..
But these guys have made me feel like I SHOULD return the favor, bare in mind, they never even hinted at getting a review from me.
The price is steeper than most services, but you get what you pay for, two thumbs up