For me the downrange velocity is very nice and interesting, and yes I will use it to compare and calibrate my ballistics app. But what really makes it nice for me is.
1. Ease of use, no rods or sunshields.
2. Cloudy or sunny, doesn't matter.
3. Don't shoot directly over it, nice for letting others try it.
4. Can easily shoot for group testing as well as fps at the same time.
5. .1% accuracy
+1