I have only been buying Spyderco's for about 8 years and I use them often for both work and hunting. My first was an Endura III and the second was a Delica III. I used these both for several years as my EDC's rotated with a mini-griptillian.
Then I saw the new Delica IV and had to try one. While it was a smooth opener and had a better clip I hated the new blade shape after using it for a short while, missing the sharp tip that I used for a variety of things with the Delica and Endura III. I owned 3 different styles including the waved and I have since sold all 3.
My impression of the purpose of the Delica IV is that it was meant to compete at a price point with the Benchmade mini-griptillian and I suppose it matches up pretty well in that regard. Yet I personally prefer the slimmer and lighter Delica III. I cut rope and seatbelt strap almost everyday with mine and have yet to notice a problem with it holding up. How tough does a folding knife need to be? The same goes for the Endura models.
So does anyone else prefer the older models too? I'm wishing Spyderco would produce a sprint run of them or perhaps a sprint with S30V steel.