i would say go for them if you want 20" wheels, because BMW did a sick job of making classy 20's. If you want a bigger 22" wheels likes imolas 4.8 then you got to choose the right rim, not all 22's look good on x5's, esp the chrome look, but there are quite of few different type of 22's that look better that the stock 20's, which are beautiful but thats all up to your style.

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" Despite its supercar attributes, the M5 still doubles as a soberly practical, spacious saloon - only with the ability to scare four passengers in comfort all the way to the local coronary unit". Top Gear