Well I have purchased a bunch of knives the past couple of months. Two of the finest without doubt are the above mentioned knives. The Kersahw Whirlwind and the BM 550. Both knives have a great gadget factor to them being the axis lock for the 550 and the speed safe mechanism for the Kershaw. Both are are/were extremely sharp out of the box. They have stayed that way too. I think the 550 may just out cut by a small margin the Kershaw but that is a very subjective thing. Not using them for anything but mundane cutting tasks etc. The Kershaw is alot more fun though. Unreal fast and has a great lock up and snap to the blade. The liner lock does not budge on the Kershaw at all when performing the spine whack test out on the point. The 550 axis lock is dead nuts solid and extremely smooth. I think they would have a block buster on there hands if they used polished micarta, full size liners, and a 4" blade of the same style. Some people just aren't going to go for the plastic thing. Doesn't bother me at all really as it makes it very lite to carry in the pocket. People friendly too. I have 3 more in the mail so they should be coming shortly. A lg XO Lite, a large CS plain edge clip point, and an MOD Tempest. Anyways just some brief impressions about some of the smaller knives that really rock. Keep'em sharp