In reply to The Potato:
I like the SIS bottles for riding with, as I like the bite valves. Only time I've thrown a bottle away is when the rubber parts of the bite valve split.
Given a few away, such as a couple to my cousin when I was having a clear-out, as I didn't like the red tops with my new grey bike and SIS had started doing black tops.
Otherwise, pretty much all my bottles have been freebies from some event/promotion and occasionally get used for other sports.