I have used the "no dog" brand for over 15 years....still using the same one, and it gets abused - bottom of the toolbox, falls out of my pocket on a lift, etc. Works fine still.
I am considering "upgrading" to the GreenLee model($36). The GreenLee model costs about 3x what the original no-dog costs($12) and is about $5 higher than the "no-dog" brand tool with 5 vials(no thumb screw~$30). The GreenLee model has 4 vials and a thumb screw .
