On the plus side, there is a lot to recommend the use of aluminum parts:
Corrosion-resistant. Aluminum oxidizes quickly, and the resulting surface coat of aluminum oxide resists further corrosion, by air, water, and chemicals. This protective coating is clear, colorless, and non-staining.
Colorable: Aluminum can be easily colored by anodization, and holds paint extremely well. Aluminum can be finished in various ways.
The GN 565.2 angled cabinet U-handle on the right is shown in the version with a black powder coated finish, but is also available in bright tumbled finish or natural anodized.