Each Sidewinder is custom made for you and your canopies. Rob Warner Sidewinders impress me with their comfort, ease of packing, durability and dollar value.
Sidewinders seem to fit best on medium and tall people.
Packing a main canopy into a Sidewinder is straight-forward, and the reserves are a little easier to pack than most of the other Vector clones. The molar bag helps, but Al MacDonald is more graceful at designing reserve flaps that fit perfectly. This year I have packed about 50 Sidewinder reserves ranging in size from the smallest of personal rigs to Student Sidewinders containing Tempo 250 reserves. My only disagreement with the Sidewinder design is the Velcro on the lower corners of the reserve container. Intially I cursed the Velcro, then I cheated with clamps and now I am learning to close them free-hand.