I am trying to make a decision on what to get.
We currently use Verizon, so I could just add a LTE iPad Mini to our account of shared Data. My other option is just to get a WiFi model, and tether it to my iPhone. This feature is currently free with my current plan as just uses the shared data pool.
If Verizon would be able to support Voice + Data simultaneously, this would be a non-issue. However I would use this tablet to supplement my capability for working away from my office, so I don't need to drag my Laptop out with me all the time.
"Here, let me hang up with you so I can use the internet, then call you back."
I think it comes down to convenience vs cost, as most things do.
I also fret over purchasing 2 LTE iPad Mini's for about a grand, then have it upgraded by Apple earlier than expected. However I really could use the mobility now, then later this year.