I can so relate A.M... the Grav bug bit me late last year and I kept just coming back to it before I scored one.
I really should take the time and line it up with some other liner locks for comparison pics...
You've probably already seen me post this pic, but here it is again "in traffic" with some other popular blades. Pictured are the CRKT M21, BM Grip in D2, BM 910 in M2, BM 425, BM 710 in M2, S30V Native, Calypso Jr in ZDP-189, Leek, Chive, and BM 921 Switchback.
I know you have an M16, the Grip easily out performs the very-similar M21 liner lock as far as strength and rigidity. Of those pictured above, the liner locks are the M21, BM 910, Grav, and Leek; and I'd rate the Grav as being the toughest of them all with the 910/Leek having a close tie for second (and the CRKT being the least robust).
I'd hate to be lambasted for saying this (without ever having made a physical comparison in person) but the liner lock and frame of the Grav could be said to have Strider's or Airkat's reputation for being overbuilt.
I do wish I'd have managed to get a satin though, but as you can see somehow I've attracted a fair number of black-coated Benchmade blades.
I've seen/handled the Spyker...it just wasn't my personal cup of tea. That ZT400 looks like one sweet blade though, and if it comes down to wanting a smaller blade I don't think you'd do wrong with a mini-Skirmish either as you can see that Grav is almost as big as the 710.