I have one of each (plain and serrated) that are just a bit uncomfortable for my hand. I bought them when I was building my Spyderco collection, and have kept them so far because I was hoping the value would increase a bit more.
The locks are both just fine on them.
I am not a clip on guy, I carry down in my pocket most of the time, but the clips seem fine, just odd with placement. Like DaveH said, its just a bit big, wide and blocky to clip-on.
The part about it that is uncomfortable is that my finger is right on the cutting edge when its in the choil at the pivot. I absolutely love that choil on knives, and most are fine. This one makes me feel like I am going to cut myself. The opening arc is also a bit unusual.
As for blade steel, I have always liked Gin-1. Heck, I like ATS55 too, and ATS34. No, Gin-1 steel is a fine steel in my opinion. Easy to sharpen.
That Sal would get down here and discuss this with us is cool. Sal is a good friend to the knife community, in my opinion. For several reasons.
Back on point, its interesting to me to watch values of the originals when sprints or new versions come out. The R and R2 come to mind.