The 150 is a fine lens. I have issues with mine that I need to get sorted, the OS is acting up somehow, I can only assume it happened when it was in the bag and I knocked it off something, as it never got a knock in any other way during use. But it still works, I just leave the OS off until I sort it. It seems an ideal length for macro, the lens is neat and tidy for a 150, not very heavy and is also great for portraiture. I eyed up the 180 too before choosing. Figured a 150 would be more useful for general shooting besides just macro.