Useful for travelers and for presentations. Very powerful for virtual use as well. Don't forget the Apple Care Plan.

For laptops, to reduce wrist strain. We also use one for lectures and presentations.

With any luck, your office still has valid copies of Windows to throw on your new macs. Otherwise you have to buy all new licenses which is maddening since the whole point of the switch was to lessen transactions with Microsoft...

Crucial for photo work.

We are still moving from Peachtree to Quickbooks. No word yet on whether this is going smoothly or not, but by all accounts, this shouldn't a gigantic problem. But what do I know? I do graphics, not finance.