Trans fluid substitute

I have a 2006 model Cub Cadet GT2544. I have spent some time researching a substitute for the 737-3120 Drive system Fluid Plus.

Apparently a lot of folks have successfully used Rotella 15-40 in their transmissions with no adverse affects.

Since most of the posts I read were several years old I would like to ask those of you that have used the Rotella over the years if you continue to use it? Any problems?

thanks,

Trans fluid substitute