Two weeks after buying my 535iM, I went into Borders and picked up UK BMW mag. In the back where they had their buyers guide. I was pleasantly surprized to see an article on the E34.
They said out of all of them, including the M5, the 535iM was the pick of the lot. It was powerful, fuel efficient (within reason), handled beautifully, and all brought it together into a usable daily driver.
So that put a smile on my face... correction, a bigger smile.