The Thule clamp is bulky, but it's built to hang a handlebar bag, which is much heavier than a phone. The side-clamp and corner-bungee mount is belt-and-suspenders secure. It fits right over the centerpost so it doesn't get in the way of my brake levers and shifters (I have straight handlebars, and this was an issue with other mounts I checked out). And Thule has a well-earned reputation for bulletproof gear. Best I could have gotten!
Pros: Sturdy and stable, belt-and-suspenders secure
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