I Have been using IB for years. I previously used MB Realtick. When I first ran them side by side they were for the most part (in sink) I began to notice when the market was moving FAST IB was able to keep up when MB would lag for several seconds. I was able to capitalize on this for a few years. The last Year or so I have needed other feeds to keep up with the market. ??? Is it because IB is now offering so much more (bells and whistles) then they were in the past ?