I just got my new 30mm level from Flatline Ops. I was a little nervous spending that kind of money on a level but I really liked the idea of being able to flip it out when needed and then flip it back out of the way when i dont need it out. I was worried about how sturdy it would be and how much slop there would be in the hinge but that things is sweet. its tight, and quietly snaps into place and wont move unless you move it so no worry about keeping it in the right position. and there are set screws for adjusting once its mounted if its not perfect. very simple and awesome quality. I wish I had bought it sooner. I highly recommend trying one out! and you know me... I dont just hand out atta boys to everyone, this is a quality tool!