I hear that tjc! The first time I tried a zero turn I was ALL over the place. I gotta hand it to you to attempt the widow maker maneuver (ramp load) on your first ride! Impressive indeed.

I have yet to operate a Z-Force and have one on order. I'll be curious on the trans oil change thing for my Z-Force 44 as well. It's got the Hydrogear ZT-2800's transaxles, which are essentially like yours, but have a small spin on filter on each trans. I assume you drain it by removing the filter and fill through the plastic reservoir bottle. I haven't seen a single post on servicing these yet.
Joel