Glad you like the report... purely my subjective view........
The price varies I think on model and gearbox combo - some are a little more awkward to fit I gather (manual tranny more awkward I think). Its just shy of £1500 fitted (and of course it comes with a warranty) but I gather from reading the forum that serjames may have negotiated a bit of a discount for e90 posters...
All the pricing can be found on the Birds website here :
www.birdsauto.com
ARBs next for me I think........