I own a double edge partially serrated Combat model. It failed spine whacking, so I haven`t used it much.
The part of the liner, that you`re supposed to use to disengage the lock, is placed in a bad position. If you hold this knife in the F/S grip, which I believe this knife is designed for, either your thumb or your forefinger will apply pressure to the "release part" of the liner. On top of that, I think it is possible to release the linerlock during utility use - if you don`t choke up on the handle.
I actually liked the opening action on mine. But, remember that this knife is not designed to be opened with an arching motion by the thumb. One is supposed to push the stud straight forward, with a thumb movement that is paralell to the handle. When opened like this, I actually find the action quite slick.
Nils