I've been using it for a few years now. I have not tested it at any appreciable range, but out to 200 on paper I have found it to be pretty accurate with bullets impacting within 1/4 to 1/2" of where it was predicted...
I use it for hunting applications and not doing competition target shooting, so my expectation level may not be as high as some. I've been happy with the results.
I just wish they would add Hornady's 6.8 SPC 120 gr SST to their database... I have to add the bullet and MV.