Shared data vs separate data plan. Any advantages?

The cost saving should be more than enough reason to switch for me...

You'll save $20/month going this route. If you find yourself using more, pay an extra $10 for the next tier and save yourself $10/month

I think you'll have to grab a new sim if I'm not mistaken...

 

Generally speaking:

A) If you don't use more than 2gb data per device/month
B) You have more than 3 data devices
C) You aren't giving up a grandfathered unlimited plan

Then the data sharing plans can save you money. There are some variations where it wouldn't, but in general, that's how I've calculated the break-even analysis.

For me, I ended up saving over $140/month moving all our devices to a shared plan, ended up with MORE data allocation and included hotspot for every device. Worked out in my favor in a big way. But as always, YMMV. Do the math for yourself.

 

If you have a minimum of 3 devices then a shared plan MAY make sense. Do the math and know how much data you are currently paying for...