I never looked at an all metal ultrabook, however, Lenovo has an interesting ultrabook if the prices doesn't scare you. The 14" ThinkPad X1 Carbon is priced similarly to Macbooks, but it's case is made of carbon fiber which is a very light yet strong material. Stronger than metal. ThinkPads are basically designed to be highly reliable. My IBM ThinkPad T40 from 2003 still works fine.
The base price ranges from $1,249 to $1,599 depending on which model you are looking at. The starting weight is 2.9lbs so it is a very light 14" laptop.http://shop.lenovo.com/SEUILibrary/controller/e/web/LenovoPortal/en_US/catalog.workflow:category.details?current-catalog-id=12F0696583E04D86B9B79B0FEC01C087¤t-category-id=0E6E3D0084869C3EB4172DA2F965A301
It's not something I would buy though (actually I'm not interested in any ultrabook) because it lacks an optical drive and I prefer a high capacity HDD rather than a low capacity SSD. However, I do like the fact that it is 2.9lbs.