I own a BenQ W600 + and these could be mounted using the ceiling mount to the ceiling without problems. The flexible setting for the bolting to the projector makes it possible to fix projectors in various sizes on the holder.
The bracket can be adjusted continuously, thus making it very easy to align the projector to the screen. For mounting on the ceiling two screws are necessary.
The bracket is made entirely of metal and acts as well as very high quality. I have since the mount no problems at all with the mount and can this 5 out of 5 stars so highly recommended.