How well do the 303 respond to acceleration since most of the weight is on the rim? Have you had any problems with your 303s in terms of reliability, staying true, breakage, cracks, warpage, etc.. since you do use it daily? Just ordered a custom wheelset using Hugi 240s hubs, Hugi 1.1 rims and super comp spokes for my training and commuting days and have always lusted after a Zipp carbon wheelset for those hard Sunday group rides.