I just did the fronts in my 2010 e70 with the B6s. I’m happy with them for what I was looking for (firmer than stock but able to deal with nj roads). If you’re looking for “comfort “ I looked really hard at the koni fsd’s. Supposed to be premium comfort but stockish in the twisties.
When I did mine, the foam doughnuts that sandwich the spring hat/upper chassis mount were completely toast. Since these aren’t a McPherson strut (no strut bearing on top) the doughnuts won’t effect comfort. Because of this, I went with polyurethane. It’s the only place I have poly in the entire steering and suspension system. I actually bought the monoball tension strut for the front because I keep toasting meyle HDs. I refuse to put poly anywhere else. In this application, however, it won’t hurt and will far outlast the oe ones.

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- Tom
‘10 E70 diesel, hud, hot/cold weather, 3rd row.