qrdaemon: You are

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I've owned one since 1997 when something goes wrong I simply fix it. In your case it depends on many factors among these:
A. How much you willing to spend for the car will determine the year and mileage.
B. How much of the basic repair stuff you can do yourself can save you a lot of $$$
C. Repairs history, ex-owners habits do play a major role in what you get.
So 528i as such is an excellent car on its own and does stand tall among the crowd; beyond that it all depends on how it was driven; and on what you can get for your money in terms of year/miles.
good luck on your purchase
regards
billb