Congrats, OP. I have the 100-watt iStick, and although I've since moved on to fancier TC mods, I still go back to the iStick every now and then. I think it's a great device, even at nearly double the price. Mine has been absolutely rock solid, and I think the ergonomics are great (although I do wish the surfaces were a little "grippier"). It's a great platform for your Atlantis v2, but it has more than enough power and capability to grow with you as your vaping habits and preferences change (as they inevitably will).
As for charging, sorry if you already covered this, but do yourself a favor and pick up an external charger when you have the chance, along with an extra pair of 18650's. Safer and much more convenient IMO, particularly if you're charging overnight. USB charging is nice for topping off during the day while you're on the go, but a decent external charger ought to be on your short list of things to buy next.