I bought a Speed Grip S and it makes my SQ-A *much* easier to use. However, the lock feature on the shutter release...doesn't. It "locks", but there's enough travel in the release mechanism before it hits the lock to release the shutter. This is a problem, because I tend to handle the camera by the Speed Grip in between shots, and I'd like to avoid taking any unintended shots while keeping the camera cocked.
I agree. The speed grip makes it so much more convenient. I will check, but I don't recall having the same issue with the lock on mine.