I just received the RussLock Friday. Wonderful little knife. I find it to be just big enough to allow a four-fingered grip. The one-handed opening is not fast, due to the strong backspring. I think the backspring is superfluous, since it is also a liner lock, but I guess it does ensure the knife won't start to come open in the pocket.
I think Case would be wise to fit it with a slightly weaker backspring. Thanks for the pix, NixelPix, the "in-the-hand" shot really helped put it into perspective.