I use the thing pretty much everytime I test at 500. The more you use it the better the quicker you get at setting it up.
The features of the unit are helpful. You can number each shot or move the group around on paper with your scope and then number each group.
Saving a picture of the target is two button pushes. Not hard to keep track of where your at at all.
The blinking mode works ok but you have to touch the thing for every shot. I typically shoot clean paper everytime so I Don't get much use of it
You can measure your group at distance. But you need something of a known distance pasted on your target to calibrate it. I have played with it and it works. Usually dont take the time.
I find it to be a very useful tool.
Dave

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Only accurate rifles are interesting.