I was playing with the spread comparison tool at Fastbrokers.com website and I think is worth a look. They publish historical spread rates on their multiple feeds, based on ticks, hours etc. As they offer multiple ECNs access it seems to be useful tool. This is a transparent approach. What you guys think?
http://www.fastbrokers.com/trading/forex_statistics.php
http://www.fastbrokers.com/trading/forex_statistics.php