"What made all of you got with the cellular version?"
Not having cellular on previous versions of my iPad.
I travel a lot. For me, it's a nice emergency backup in case misfortune befalls my iPhone - no power, I leave it somewhere, it breaks.
Ordinarily I use the hotspot option that comes with my Verizon service plan. I opted to purchase the T-Mobile iPad, because I liked the idea of those 200 free megabytes.
By the way, I traveled from L.A. to Phoenix with my new 'Pad Air, and from Phoenix to Moab, Utah - 900 miles. The iPad, when I put it to the test, connected to the Web almost everywhere T-Mobile said it would, which was most of the route, and that included the middle of Monument Valley, on the Navajo reservation.