rkapsi has explained the difference between bits and bytes, but you could go here for more explanations and test your actual speeds.

http://www.broadbandreports.com/stest

A shielded leaf is good--this means your connection is not being swamped with irrelevant queries (but it also means you don't get to see what others are searching for). Your ultrapeers are taking the bandwidth hit so you don't have to.