i have the same issue with the delay upshifting on my 04 x3 3.0i auto.....
is not really that bad and it only happens sometimes...(i've only notice it in few incident.....in the 30k miles that i have put on it)
i know there is a SB for it......i m monitoring it for now...and if it get worst then i'll bring it in for the reprogramming....(the car is now under BMW CPO at 57k miles)
i have not notice any slow downshifting or hasitation that others have mentioned......
Now - '14 Volt -12' Audi A6 3.0T Prestige- '10 Porsche Boxster S
SUVs-'08 Acura RDX Tech -'04 BMW X3 3.0
2 doors -'01 Audi TT QC 6 spd -'01 Toyota MR-S - '06 BMW M Roadster -09' BMW M6
4 doors -'01 BMW 325i E46 -'96 MBZ C280 Sport -'12 VW Golf 2.5
no doors- 00' Suki GS500