Yay:
Manix
D'allara
Native
Cara Cara
Endura 3
Nay:
Delica 4 (Couldn't fit 4 fingers on it, didn't feel right with just 3.)
Meadowlark (Didn't feel right in 3 finger grip, with 4 fingers the grip felt unnatural and my thumb felt squished)
Para (4 finger grip only worked well in the choil, which again squished my thumb.)
Yojimbo (This one I always thought looked comfy. When I tried it I found only certain grips felt good, the rest felt unnatural. Disappointed with the ergos overall.)
Dragonfly (I think the large finger groove feels terrible for any finger but the index finger. This ruined the knife for me, as well as the choil placement in relationship to where one places the thumb)
I've had a very specific complaint with Spyderco's ergonomics for some time now. I described it a bit with my Dragonfly comment, but I think I need to use photos to really illustrate it. It has to do with where they place their choils.
First, the Endura 4. I have not handled it, but my Endura 3 is similar enough.
If you look at the photo, I have marked where my index finger and thumb would lie if I picked up the knife and held it in the most natural feeling position for my hand. Every knife I use my thumb instinctively goes to the spine of the knife. With the Endura this works well because of the space between the thumb and index finger positions.
This is the Dragonfly model. This is one of the most uncomfortable knives I've carried, which disappointed me because I was attracted to the small, light package with a full flat grind. This is why I didn't like it (As well as the Byrd Meadowlark, the Para and even the Yojimbo to a degree).
As you can see, the index finger and thumb positions are nearly right on top of eachother. If I scoot my thumb back far enough to fit on the thumb ramp, which is needed so my thumb isn't in the way of what I'm cutting, this is not only unnatural feeling for me, but it actually hurts my hand to even use a knife in this sort of grip. Most of the knives that are designed this way are too small or uncomfortable for me to use out of the choil, making me sell the knife for another design. If I place my thumb on the spine of the blade up past the thumb ramp, this is usually uncomfortable as well and often gets in the way when I'm whittling etc. This is the only major complaint I've had with Spyderco knives since purchasing my first. I can accept that some knives will have ergos that don't fit my hand as well as others, but this is something that I've honestly wondered if others feel is comfortable.
Something else that has bothered me in certain designs (Meadowlark, Dragonfly, Delica) but not in others as much (Native) is the oversized finger groove. I think it feels great in a knife like the Endura where your index finger falls into the oversized groove, but on one like the Dragonfly where your index finger takes up the choil I think the groove feels really bad when placing your middle finger in it. Just one of those things that never felt right to me. When I bought a Delica 4 (My first Spyderco) I wasn't sure if I should put one or two fingers there. Two fingers felt cramped and with one finger there....well the Delica always felt like a knife that just shouldn't be a 3 finger knife. It never felt right to me with just 3 fingers on it. In retrospect I should of bought an Endura for my first model.