I have had this a week and have found it very useful, both as a short level and to check right-angles on someone else's framework. Allowed me to make precise adjustments so that a circular deck built in four quarters (badly!) ended up being bolted together nicely. A lot cheaper than a digital Stabila level for precise truss angles, for example, if you already own a nice level. One slight complaint - you have to open it up to see the horizontal bubble.