[hpark21]

I went straight from Z1 -> Maxlife (06 EXL). Shifts MUCH better than Z1. Now, granted I have NOT tried DW1 though but no complaints with Maxlife so far. (I only have 178k or so on "weak" tranny)
I PERSONALLY, feel that pretty much ANY reputable and compatible tranny fluid will be just fine as long as you replace it in timely manner and don't drive like a mad man.

I am keep extending replacement timeline of the minivan. First, it was until kids graduate from middle school, then when they go to college, then now, it is until they graduate from college and one of the kid DID graduate this year and the other will do it by next year so looks like I may have to reset my goal to maybe when they get married or something... They practically grew up in the van - since kindergarten for my younger son.)

 

[hpark21]

I had shift stutter as well (way back when I used Z1 fluid) and I switched over to MaxLife and the stutter was gone and I stuck with Maxlife.