Also go to Perfume Apprentice and get extra bottles--3ml for mini, 6 ml for Grand. Makes it easier to store and change flavors if you like to do it a lot. I can't wait for mine to arrive. I'm already tired of cleaning out the bottles to reuse for a new flavor.
While the Grand is not all that big, it is quite heavy for its size. It weighs about twice as much as a cell phone would in a comparable size. On your desk the weight makes it very stable and not the least bit tippy. I don't have a mini, but I can see how it would be more pocketable.
The Grand (mini I am sure too) works great with cartomizers. Read the thread how to blind juice them. It helps eliminate juice leaks from the overflow well on the go. My emergency kit will include a carto or two in case my atty goes on the road. Not having to top off a carto and it's consistency make them worth trying.
Also as recommended a million times have juice with a lower nic level than normal, because it's difficult to stop vaping this thing constantly. It's just too easy, especially when you don't have to open juice tops and drip.