I like my superfeet a lot. I used to always get blisters.
The important thing for me was to find someone who really knew what they were doing to help me get a pair of hiking boots that actually fit. Turns out I have a narrow heel - which means heel lift - which means blisters. The superfeet help immensely.
As far as finding a person who know what the heck they are doing, look for some combination of a couple of things: someone who measures both of your feet, someone who can explain _why_ a certain manufacturers boot will fit you better than anothers, someone who can tell you what kind of foot you have (low-volume, high-volume, funky toes, etc).
Good luck.