This is impact's TrustRating, which is based on both the number of reviews impact has written, and how many other people have voted those reviews as "helpful." It's a way to quickly to determine the value of any single review or reviewer, because it's based on how helpful impact has been to the Kudzu community.
These guys are very helpful and the prices are great. The turnaround time seems pretty quick and with lots of shops within walking distance, having to wait a little bit isn't so bad.