I have a speedfil which looks cool and works adequately, but I am unable to see how much I have consumed. I am not a good drinker, and on my last 2 hour ride I wanted to consume 40oz of HEED. However, I only consumed about 30oz. Does anyone really like a front mounted hydration system so that I will be ablre to monitor how much I am drinking?
I hear what you guys are saying about the liquid level, and I think that if you do not have the weight of the bottle in your hand you will not get as good of a feel with water at least. You may look at the Bontrager aero bottle as a mix of both.