A quick review of the pocket clip:
After having it on the knife for a few days now, I can say it is a very good upgrade to the Gen 1 ZT 0550. For one thing, it looks so much better than the stock Kershaw clip they put on there, because it matches the titanium handle slab perfectly, and the shape matches the lines of knife much better.
It actually functions better as well in two key areas. The knife is now much easier and faster to deploy from my pocket, and it slips on much easier as well. The second benefit is that it allows the knife to be opened much easier. If you own a Gen 1 0550, you know what I am talking about. If you don't, here is the low down - the detent in the blade where the ball bearing sits in when the knife is closed is very deep and cut very sharp, thus the knife, when new, is VERY hard to open one handed. Also, the spring for the ball bearing is very strong. There are several solutions to fix this, but I chose the ones with the least about of modifications to the knife: (Some of the other methods may void your warranty) First, I put some Flitz metal polish down in the detent hole, and worked the knife probably several hundred to a thousand times over a few days (This is a best done while watching TV or movies at home.) The Flitz helps to polish the cusp of the detent hole, allowing the ball bearing to slip in and out more easily. The second thing to do is let the knife sit for week halfway opened so that the ball bearing spring is compressed, which will help to soften the spring a bit, and both of those things combined will make the knife about 50% easier to open. (Or you can send it back to Zero Tolerance, & see what they can do - but you have to wait to get your knife back, and pay to ship it.)
Now here is where the second advantage to the titanium clip comes in. If you carry right hand tip down, this will be where you see the most benefit, I think. Titianium is a very good memory metal, so what that means is, is that the clip presses less on the locking bar putting less spring pressure on the locking bar, thus allowing the ball bearing to slip out of the detent that much easier, especially when carrying in the manner I described. It may help in tip down carry - I don't know. But what I do know is that after I put this clip on, the knife was now about 85% easier to open! That in and of itself is a win to me. This may be (short of custom G-10 scales) the best practical upgrade you can make to this knife.