Hi Edouard,
I like Apple products a lot, but the Magic Mouse is an exception. I may be old school, and because I always sit very close to my computer anyway, I moved to a Logitec M500. Cheap, very accurate, good size for my hand, and 200% reliable. And never any more messing around with batteries or loss of control in case of bluethooth issues (rare, I admit).
Same for the keyboard by the way: the extended keyboard (wired) may not look as good as the small wireless one, but much nicer to use imho.
Jos