I did Euro Delivery on Oct 2010 and picked up a 2011 335is convertible with DCT. Loved driving it in Europe.
However, when I got it back to the states, the delayed downshift drove me crazy. I took it into the dealer and they said it was normal.
I had been spoiled by VW's DSG dual-clutch box and found it hard to believe that BMW's version was buggy. I sprung for the 335is because of the DCT availability.
But between the shifting lag and weird stalling when slowing and turning at the same time, (known DCT issue on the M3s) I traded the car one year later for a 335d.
I'm so much happier with the D it isn't even funny. The slushbox in the D blows the DCT in the IS away. And I get 10+ more mpg with the same level of power.
2012 X5 3.5d Jet Black / Black w/ Sport Pkg - Loaded
Mods:Factory 214 Y-Spoke 20" black-chromed wheels - Gloss black grilles - LED front/rear turns & fogs - coding mods
Other rides:2006 VW TDI Pkg 3 / 2008 Duramax LTZ / BMW K1300s
Previous rides:2011 335d Jet Black / Black w/ Sport Pkg - Loaded