Although I have yet to use on my bike, as it's deep winter here, I use the bottle for everyday workouts (typically spin classes). I have no negatives
It is easy to mount on a visor, but not on a helmet with out a visor. Found an attachment device the works pretty well. Once mounted in a good location it is easy to a line the mirror for looking at approaching traffic. It is very light weight and good visual field.
In theory the build it in the box sounded like a great idea. The one I received however had a major flow in one small piece which made it impossible to instal in box. It required me to mount it to the hitch and then loosen every bolt so I could install the tray rods and subsequent back plate. The product its self is easy to use for the most part, secures the bike snuggly and is very sleek, slim and lighter then the Thule. However, if it wasn't for the astronomical return fee I would have returned it and purchased another Thule XTR.
Well designed and well made, these are getting outfitted on every bike in my stable. They look clean and nice, attach rigidly without rattles, are super sturdy, and most importantly, they cover as much as they need to. Just a few inches off the ground in the front, and down past horizontal in the rear. (This is my biggest qualm with Mud Butlers, which don't cover enough.) These will keep your toes dry, and not spray everyone behind you. Nifty hardware and replaceable parts if you need them.