I know a few people have done this change, but I haven't seen many details for answers to questions (that I had at least). So this only applies to the B9.5 models, my stock wheel in particular is round, alcantara, hands on detection, and is heated. The new steering wheel is from the RS6/7 and has the flat bottom, hands on detection, and I optioned mine with alcantara to match my RS Design alcantara interior.
So about the new steering wheel. Hands on detection still works (and is required otherwise it will throw a code). It's heated as well, but that comes with a caveat. My current wheel has the assignable * button, the RS drive mode button, and the heated wheel button (3 separate buttons). The new steering wheel loses the assignable * button, and consolidates the RS and heated wheel button to one button. So you have to choose whether you want that button to be for heating or the RS selector. I went with the RS button since I use that the most.
Cons:
1) You lose the ability to heat the steering wheel. It can't be coded in (or to be accessed through the MMI) and the "turn heated steering wheel on" voice command does not work.
2) It's expensive because you are buying a heated wheel with hands on detection, regardless of whether you had heating on the stock/current wheel. Also, you have to buy the airbag as well.
Pros:
1) It feels awesome in the hand! I opted for the leather trimmed airbag cover and it makes a big difference (for me) in the upscale look and feel.
2) Compared to the round wheel, it's exactly the same width across but obviously it's not as large vertically since the bottom is chopped off. The new wheel is also thicker especially the 10 and 2 notches. It's basically a few millimetres thicker all around with the exception of the 12 o'clock position...that diameter is the same as the stock wheel (I'm assuming so it doesn't block the virtual cockpit display). It's very girthy feeling and has more protrusions/notches even as you move down around the 8 and 4 area. The stock wheel is perfectly round and has no protrusions at all.
3) No heated wheel errors like some changing from a B9 with a heated wheel are having (presumably because this wheel has the heating elements although not being used).
Here are a few before and after pictures (I also installed the little center console cubby with lid. It does a nice job filling in that big cutout from where the B9 MMI controller once was).
9DE1760D-F5F1-49AA-ACE5-11A6ECE8E959.jpg5C3C9FE3-4972-4E2D-BDF9-57A8887FE4E4.jpg
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