Review on Universal Motorcycle Bicycle MTB Bike Handlebar Mount Holder for Cell Phone GPS - Compatible with iPhone 7/7 Plus, iPhone 6/6S/6 Plus/SE/5s/5c, Samsung Galaxy Note 5/4/3, S7/S6/S5/S4, HTC, LG by Rudy Santos

Until it broke on a trip this morning I would give it three stars. I ride 50-60 miles a week on fairly flat canal trails with few bumps. Even if you tighten it as hard as you can, it still moves a little even when riding over a modest bump. It's definitely not made for mountain bike trails, but it's performed well on both tarmac and gravel trails to this day. Judging by the photo, everything is done clean. I was actually driving on slick pavement when it happened and the fall shattered my phone screen. (Which is good) I missed the return deadline which is annoying. I'd recommend looking for something a lot more robust, especially if you're going to be using this fairly rough terrain and don't want to adjust it every time you hit a bump.