As a (granted, not very important) data point, my '09 has 35,000 miles now, and I had the fluid changed at 30,000 using MTF-LT-2, with no perceptible difference in feel (as could be expected). I don't know enough about oils to give you a recommendation one way or the other.
On a related note, however, I think the SMGIII will always be kind of "cluncky", because it's basically what you get when you try to teach a robot from the year 2005 how to operate a manual transmission. There are any number of sensor inputs and algorithms floating around in its little robotic German brain. You have to think a step ahead of it, which is a challenge I kind of enjoy!