I just purchased this level and recently installed it.
I have only used it once at the range. This is the very first bubble level I have ever purchased and/or installed for a rifle. The installation was a tad difficult by myself, I needed a third hand.
The single screw clamp system could be improved. However, I know that was done to save weight and it is super light. Once installed it works perfectly and I know it will be a game changer in the field.