[Johan]

For what it is worth, I have several sets of mag wheels. Some are old and some are new. The new ones are either made by Dymag or M & A.
There are a couple of characteristics of mag wheels that you should be aware of.
They leak air and they corrode.
M & A has a process called impregnation to help with the leakdown issue. If you get the wheels, get them impregnated at M & A. This is different than paint. Race cars do not matter so much because the tire pressures are adjusted before each session but for a street car you want to have a wheels that does not leak worse than the tire.
The corrosion eventually stops the leaks, but still you don't want corrosion !
Steel wool and WD40 will clean them up to a good race car standard. We do the wheels when we put new tires on them.
If you are after the highly polished look, and your car has no patina, then you probably should stick with an aluminum wheel and get it clear coated.
If you think a mag wheel looks great, like I do, then it is not necessary to do much more than WD40 it every few months or so.