My original review is below. I emailed Arundel the day after I wrote this review. Two hours after I sent the email I received an email asking for my mailing address. Two days later I had two new bottles that work perfectly. Have not experienced a bottle launch yet. I will continue testing this on rough roads. UCI does not govern triathlon so that is not an issue for triathletes; however, it does apply to any UCI governed time trial.
Original review: Very nice fit in the bottle cage. Just the right width and height for my Trek Speed Concept. Looks like it helps the aerodynamics, but that is not based on any data. Unfortunately the cap leaks. There is a slight mismatch between the tread pitch on the cap and the tread pitch on the bottle. Finished a triathlon covered in sticky red sports drink a few days after I got it. Should have tried it on a training ride before racing with it. Wrapping plumbers tape around the bottle threads seems to help but I will only use it for water in the future. I don't recommend it. It is OK for a free bottle from an event to leak; however, at this price it should work perfectly.