Personally, it was a problem. There were also issues due to stomach cramps. There is no delicate way to put this so… it is very hard to pass wind with it in and over time the gases build up and cause cramping. The fluting on the side of the 2.0 is inadequate as a vent and one has chatted to a couple of people who have had this issued. It is OK for short term wear, but it is not a favourite for long term.
There is a large one that weighs in at just under 11oz (310g for the rest of the world). None of the issues and more of the fun 🙂