I have to agree mate...I was a bit sceptical at first, and then it took a bit of getting use to, as it really started to highlight errors that one can make with scope alignment - especially when you get a bit tied/ lazy after a long days shooting...that's normally the point at which I give up and go home! But this helped me to raise my game for the final few shots of the day - and really helped

In short - recommended! (though for 20 quid P+P should be free in my opinion)