I too would like to hear opinions about getting the Rod Sutphin's transmission tune (v2) for my 2011 35dx that currently has 57k miles.
I usually take the stance that BMW tuned the vehicle at the factory to its best and most reliable operation. I’ve also heard that the ZF transmission is pretty close to its limits for handling torque with the ‘from the factory’ engine tune.
Not sure what parameters the Rod Sutphin's transmission tune (v2) affect so combined with the above assumption about torque limits am skeptical of altering anything from factory with a ‘tune.’ That said, there are certainly improvements over time and maybe that is what the tune does, bring the transmission to more current specs.
Thanks in advance for any responses from those with technical and personal use knowledge willing to share their experiences.