I got a call From Higher Impact today, so I came here. They seem to be improving.
I have not done business with them at this time. Just looking.
I dug a little deeper, followed the link above, and their BBB rating is now up to a "C" (do to their length of time in business) and they have processed all 12 complaints in the last 36 months as "Resolved". Not the best, but not a raging mess like so many I have checked out here. Use your own judgment and intuition, and "Buyer Beware."
I suggest you follow it yourself and see what is so when you want to know in the future.
http://www.bbb.org/central-northern-western-arizona/business-reviews/internet-marketing-services/higher-impact-in-phoenix-az-1000002480/