I was hunting for a knife similar in design to the Persistence, but a little smaller and with a finger choil. The Cat fit the bill perfectly. Being a jimping junky I had to have the S30V model. I was perfectly satisfied with the 440C, but I want the jimping. This started a very difficult hunt. Here is what I found.
First the S30V models are terrible. I bought a factory second AND a QC model. For the most part the blades were okay on both. The etching was not perfect (compared to the 440C) and the spydie hole was a little crooked and unfinished. The carbon fiber on both S30V model sucked, the QC sucked a little less. I intended to use the G10 scales of the 440C with the S30V blade. After about $150 invested (Reselling the QC version) I had a great finished product.
I took the G10 scales and the lanyard hole pin/bushing (the S30V model doesn't have one and it looks terrible) and swapped in the S30V blade. Here are some pics of the etching on the blades. Notice the S30V model on the right is crooked.
Here is the notch that is put onto factory seconds. If this notch wasn't there, I would have kept the factory second blade.
Here is the damaged carbon fiber scale (around the sanded deployment area). To be clear I'm not a fan of carbon fiber anyway so I was glad to be rid of it.
This knife is great for casual EDC. Opening mail, opening packages, minor cutting. The G10 scales are pretty thin so if you need to make a harder cut (small branches, thick rope) where you have to bear down on the handle, it can be uncomfortable. A thicker, rounder scale would be ideal.
So I built a thicker/wider, rounder scale. Here it is pictured with my Persistence. Cocobolo wood.
Here it is with half G10 half cocobolo. Notice the thickness.
After it all, I still love this knife. Small simple EDC. The wire clip is perfect. The detent is strong so the knife flies open. The ergos are great (even better with the thick scales). This is my favorite Spyderco as noted with the level of effort in perfecting it.