Can an aerodynamic bottle help reduce drag? If it had the chance...
At £50 it's a little steep, but faster is faster. I'd like to say that I've used the Arundel for 100 miles, but there was a small problem with that - I can't get it to stay in the cage long enough.
From the two rides with a full bottle, I've managed about 30 miles before a rogue hole has caused it to eject.
It's a great product that just needs more refinement, so unless you are riding on a super smooth surface, France for instance, you'll just be creating litter.