I have an Exposito.
I didn't test it extensively, but till now it has performed quite well. The lock principle is analogous to a normal lockback, but instead of having a lever on the rear of the handle you depress to disengage the lock, you use a small lever attached to the lock itself which, turned up, rises the lock out of its socket. It should be as good as any lockback knife, just less easy to disengage.
IMHO the issue of lock strenght is overblown. Under normal cutting usage the lock shouldn't suffer any stress, so that the blade should remain in the open position even if there weren't any lock at all.
It's just when using the knife's point with forward pressure you put the lock to some use.
And that's something seldom happens, unless you use the knife as a weapon.