What kind of roads are you mostly driving on?
I have the same combo on my F34 335i GT although with 05-22 springs; installed last weekend along with F80 rear bump stops. My initial impressions are very positive! The car feels more athletic and lot more willing to turn. The city streets near me are a mixed bag... but none of the bumps or pot-holes have upset the cabin yet and definitely no bottoming out. On the contrary I feel the car is now more composed and shrugging off the imperfections with ease. I've been intentionally driving the familiar routes so I can compare it with the stock non M suspension that was just taken off, with 51k on it. There is absolutely no comparison in my mind!
I do feel the road a lot more, specially the grooves on the highway... so on long road trips that may be a factor. If the highway is relatively smooth, the car just hunkers down and runs... I've "tested" it to 100
