My 960 is S30V.
But I've got a BM 770 with a D2 blade (the green & black G10 special ed.)
Now, this is a gent's knife (but so is the 960, more or less), so I haven't beat the hell out of it. But I've had it since the beginning of May, and I just resharpened it for the first time this week. That may not be as impressive as it sounds, because it wasn't my only EDC for the last four months. But it was my main EDC for the first two months I owned it (because it's
so sweet), and it still gets a lot of carry. It's opened a lot of mail, a lot of kitchen containers, done a lot of whittling and leatherwork.
It certainly seems to hold an edge very well, and not turn when it hits staples and such. My only experience with M2 is with much bigger knives, so it's hard for me to give a direct comparison. Benchmade's D2, M2, and S30V certainly seem to hold an edge somewhat longer than their ATS34 or 154CM, but I'm not sure my experience has shown one of those three to stand above the others yet.
As a comment, the Benchmade D2 flagship is the 806 - if you want a lot of posts on what people think of BM's D2, I'd start a thread asking about that knife.
I certainly would not steer you away from either the 960 or Benchmade's D2. I love my 960, it's small enough not to scare sheeple, but it has 'big knife' ergonomics that fit and fill my hand in a way many small knives (like the BM 705) don't. It's got a nice grind on thin bladestock - it's a hell of a cutter. I think the tip looks weirder in person than it does in photos, but it's very functional. As in, my 960 is my only folder that penetrates a cardboard stack as deeply as my Yojimbo, with as little effort. :thumbup:
A dressy, hardworking, non-threatening knife, that locks very firmly into my hand, cuts great, and stabs like a demon out of hell. It's nice having a pretty "little" knife that I have complete confidence in, come gravest extreme.
A lot of people list D2 as one of their favorite steels, and Benchmade does a good job with it. The 806 is (well, was?) their premier defense/utility big folder, their "Advanced Folding Combat Knife". Benchmade feels confident enough in their D2 to offer the 806 in D2, and only in D2.
The 960 actually reminds me of a slimmed down mini-830, which is something I've wanted for a long time.