To my surprise, the first time I carried it I yanked it from my jeans pocket and was surprised to hear it lock open with a clack. YMMV, but I can wave it open with the thumbstuds every time, in every pair of pants I've carried it in if I draw it towards the seam. I had no idea it would be like that when I bought it. The huge thumb stud combined with the buttery smoothness make it wave better than my waved Emersons . . .
Linerless, beyond the sub-frame lock bar, obviously. I held off buying one until the clearance sales killed me, and now I love the damn thing. It's big, but light, feels great in hand too. It has rapidly become one of my favorite ZTs and I have way too many of them. If I could only save three of my ZTs from a fire the order would go 454, 777, 850 at this point. The 454 because I love the damn thing, the 777 for resale value not love, and then the 850 for love again. Apparently I should just auto-buy any sub-frame lock knives that ZT puts out . . .