I've owned the PowerAssist (S66N) for about a year and I've been very happy with it. I love the user-replaceable blades and while you may not like the 'wings', they're a lot nicer on your hands than the bare channel. Since I generally carry a small pocketknife, I don't really need a multi-tool with a knife.. So, I purchased the S60, planning on replacing the knife blade with another tool. HOWEVER, the S60N which I received, from Amazon, which appears to be the current shipping model, is the one with the single lock for the tools. The single lock sucks. No, really, it SUCKS. The S66N has the piano style locks where each tool has an individual lock. The problem with the single lock is that if all the tools, other than the one you're using, are not folded exactly right, the lock won't actually lock! This is a major problem!