WORKS WELL WHEN ABLE TO FOCUS ON TARGET AND KEEP THE UNIT STILL. PROBLEM USING IT IN THE WIND WHEN THE FLAG IS MOVING. IDEALLY WANT TO USE IT ON SOMETHING SOLID LIKE A ROOF OF A BUGGY/REST IT ON YOUR GOLF CART/BAG. FOR THE AMATUER, IT WILL DO ENOUGH TO GIVE EITHER AN ACCURATE GUIDE IF YOU CAN KEEP IT STILL OR A ROUGH GUIDE TO A BIGGER OBSTACLE. DON'T THINK IT WOULD GIVE YOU ANY IDEA OF A DRIVE LENGTH AS IT WOULD BE DIFFICULT TO KEEP IT STEADY TO PICK A BALL OUT AT 200YDS. FOR THE PRICE,IT DOES A JOB. AS THE MORE EXPENSIVE MODELS APPEAR SIMILAR IN SIZE AND FUNCTION, DON'T SPEND MORE THAN YOU NEED.