I would agree with that. If you were driving less than 10 - 15K miles a year, I think there would be a lot less benefit to using synthetic ATF. My understanding was the filter was mostly overkill and that if you were trapping a lot of metal particles something seriously was wrong with the transmission. My NPR truck just has a basic strainer in the transmission and from what I have heard it generally doesn't have much of anything even after 100K miles.

Dkr.