Gabe says that milling acrylic causes weakening and it's just a matter of time until those weak spots will fail. He doesn't want to have failures with his product line.
Machined Delrin doesn't have that problem so that's why they use Acetal for the Storm. Now that's a block I'd like to get my hands on
Phenom II 940 Black Edition quad core @ 3.5Ghz
4x2 Gigs Patriot PC2 6400
Cooler Master HAF XB EVO,
Some other stuff,
Even more stuff,
If the automobile had followed the same development cycle as the computer, a Rolls-Royce would today cost $100, get a million miles per gallon, and explode once a year, killing everyone inside. --Robert X. Cringely, InfoWorld magazine