The story from 2008 (last time they offered VIPs w/DL tops was that recessed controls are too risky.
I know W got a new CNC, so perhaps this one has solved the issue (?)
Source: http://www.unofficialwarmoth.com/index.php?topic=5715.0 (page 3 has most of the question/answer portions)
2008 was 4 years ago, I have no idea if any of that is relevant now.