I had a Vulcan for a couple of days. I bought it at local sporting goods store. It is a beautiful knife. I returned it sadly as after plating with it I noticed a problem that I hope was just a defect in the sample I had. The flipper worked too well. The clip was point up only and there is no safety to keep it shut. Very little pressure on the flipper would open the blade, like catching on the edge of your pants pocket. Also when closed the tip is too close to the edge and can prick your finger when closed. The Arc-lock worked perfectly though. As soon as I returned the Vulcan I ordered a Tomcat (no flipper). I do have both Twitch II & Twitch XL knives with flippers that work perfectly. Both also have a safety lock which because the spring tension works so well on these knives I only use when storing the knives. In short I love the flipper and the Arc-lock, I would just want to handle the Vulcan in person before I buy another one.