It looks pretty nice, stealthy. I personally have an aversion to drilling holes in the bridge, so I'd have to pass on this one.
The thing that strikes me as a bit strange; this is basically a piezo pickup that is encased in a maple plug that fits into a hole drilled in the bridge. The theory is that maple/maple contact is better for transferring sound. I fail to see the difference between this approach and using an Underwood, K&K, or any other bridge wing pickup, because at some point (in this case, within the pickup itself), maple contacts metal. Seems counterproductive to remove material from the bridge, and then replace it with a similar material, when you could instead just slide a piezo into one or both bridge wings.