Other than snooker (where the "X" rest comes from), the closest you'll find to that design in the pool world is the London Bridge, and it's actually quite good:
Although not as heavy as a brass bridge, it is by no means flimsy like those poorly molded moosehead bridges are. And with the same "X" design, the place where the cue rests come to a much finer point than the "U"- or cup-shaped grooves found on normal bridges that allow the cue to wobble around in. Thus, the same level of accuracy as the brass "X" rests.
It works great, and fits in the lid of your case (i.e. with the extended rubber grommet tube facing down into the case itself, between the shafts and butts).
-Sean
