@Poda @dibadibadu @mlivesey @Mike
Why I prefer magnesium over aluminium.
First I will cover some of the points raised here.
The point about corrosion is actually false.
Corrosion with magnesium when using the latest modern alloys and processes available today particularly in consumer products would not be a factor this side of 10 to 20 years, maybe more.
You probably will have thrown your device away by then. It would have to be severely scratched and exposed to the elements for some time to even start to corrode.
Water solublility and igniting problems only relate to Magnesium as a raw state where it is highly volatile if caused to be lit with a flame. It burns very strongly with a very bright whitish flame and difficult to extinguish. Raw magnesium is ideally covered in oil to prevent corrosion.
To ignite consumer grade Magnesium alloys requires a temperature some 100+ degrees centigrade higher than a burning lithium ion battery. Even then it probably would not ignite as consumer grade is actually an alloy, and more likely melt.
Magnesium is more expensive and a more difficult product to work with however it is stronger and lighter than aluminium. And better and tighter tolerances can be achieved in the case design.
Microsoft are not fools and I guess that one of their initial design briefs was too build a superior product to the Apple. This probably is another of the reasons why they use magnesium instead of aluminium. They use a process which I think is called liquid magnesium which is very fast chilled after molten state. This creates a very high grade product with a minimal amount of crystals forming during the cooling process, though its said be more expensive.
In my opinion when I have handled any Surface device I love the feel and finish off the metal case. It is superb and feels superior to the Apple devices.
Silver coloured magnesium as a case or body colour is great because if it is scratched then the scratch would hardly show up as the colour underneath is exactly the same as the colour on top.
Yes magnesium is not able to be anodised, this is mostly and aluminium process however colours are able to be applied as obviously shown in the surface range.
It is certainly not inferior to Aluminium!
There is lots on the web about the subject of Magnesium vs Aluminium.