When I had the 150 I never dug a bottle cap...ever, when I got the AT Pro I dug them all the time! Sure, you can just call it user error, but there were times when they rang in perfect, no iron at all, no bounce right at 81. With the 150 if it says coin, 98% of the time it was a coin. I may not have had depth or discrimination, but it was a fine machine and for a more laid-back hunter the way to go...or the 250 because being able to pinpoint is awesome. Better discrimination makes you question yourself and if you hate passing up a potential good target you dig it....and its going to be junk.