I own both the 8 X 25 IS and the 10 X 30 IS at present and have owned the 12 X 36 IS in the past. This is really a case of you get what you pay for. The 8 X 25 IS is a high quality binocular for the asking price. However, I have found the 10 X 30 IS to be a better product in performance and quality and worth the extra money. So, if you are considering buying an IS binocular go with the 10 X 30 IS. Also, I found the 12 X 36 IS to be a bit heavy for most uses.