I was considering these as I had them on my e93 335 and they were ok.
For the money I should have just went with coilovers.
They were good on the lowering springs but once I removed the springs for winter I found them way too bouncy.
With the lack of choices on the x5 I was contemplating getting them again but ended up going with KW V3. I'm actually removing them this week and am nervous about having body roll again on stock components