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Have had it done twice.

1 year ago the cover was cracked, and it was leaking oil bad. Replaced the cover at BMW (of course along with gasket), which gave it a 2 year no mileage warranty.

6 months ago the gasket started leaking again. Replaced the gasket at BMW, but the cover itself was good as expected.

It's very common to replace valve cover gaskets on BMWs........... all of mine have had them replaced at one point.

Like said above, the gasket itself is cheap and you can do it at home if you're mechanically inclined. I did it on a 6 cylinder, must be easier on the 4.