I had one on a .223 Rem target gun. The problem I had was that the company did not develope "sweet spots" for that caliber. This forced me to do a lot of shooting in order to find a sweet spot. My only other complaint was that if I wished to change bullet weights I had to go through the search function again which involved a lot of shooting. Instead I just left it on the first sweet spot I had found and did further adjusting with my powder charges (i.e. the old fashioned way).
Jim
Exactly... Which is why most owners just got rid of 'em..
