Bit the bullet, wrote the check, took delivery of the CC ZTXS6 60" this past Monday. Workload is super-busy so I haven't conducted a full-scope test mow, just about 1/2-acre mostly level fenced-in area. More significant workout planned for Saturday (weather permitting).
First drive didn't reveal anything that hasn't been shared in the thread so far. The steering effort is a bit more than I first expected, but recognizing that it's the equivalent of manipulating two lap-bar handles through a steering wheel, it's a reasonable steering effort. 60" cut was crisp and even better than what I've seen from my MF GC1705 with 60" MMM. My 42" Simplicity gives a slightly better cut, but that's to be expected from the Simplicity design and the smaller deck width.
Looking forward to the longer 'first real mow' this weekend.