I have one and it works well. Getting all the data in spreadsheet form is extremely useful. As for POI shift, I have found it really depends on the barrel. I have some rifles where it has no effect on POI or group size...and others where it will shift POI by 4" and throw bullets all over the place. Generally, my M40 type contours are stable and something like a tiny Kimber barrel does not fare so well.
It hasn't replaced my Chrony, but it is much more convenient and I can use it in the rain.
