Manual transmission flush today, with ~1.5L of RP Synchromax. Uneventful change (now that I have the quickjack 5000s, this is enabling a whole lot of maintenance that I would otherwise be sending to an indie), except that the dimple drain plug that I ordered from ECS was the wrong size. They sent me an M24x1.5 instead of the M18x1.5 that the tranny takes.
Sent them an email, and I'm sure they will take a return... but I don't want to do the job again at this point.
Shifts feel a bit smoother, and the factory fluid was DARK as it drained out. Shifter moves easier from side to side when in neutral than before.
Overall, I don't see what the fuss is all about. Check another maintenance item off of the list, though.
Still loving this car!!
Update: Got RMA approval email from ECSTuning today, and separate email that they will update their catalog.