In my set-up I use X_Trader and a charting software with a feed from another company. That way I can establish whether there is a delay in quotes in one of the feeds at the time of execution. So far the feed from IQ has been excellent matched against TT's data. If the time comes when there are frequent mismatched quotes, I'll consider adding 3rd feed, not to establish what's causing this, but to more accurately see the current prices.