Excellent tool - ever since I got the Pro-1 series 2 I haven't been able to put it down! It has opened every lock my Southord and cheap Chinese HUK tools couldn't due to variable spring tension. I have picked around 20 of the tubular locks in my collection and not a single one gave me a problem. Feedback is excellent with this tool. Ken has also provided great and prompt customer service when I had any questions. Thank you!