I completely understand the gift motive.
Let me just say this, you do have the right to find a suitable gift for your bride, period. If you do not think it is worthy, so be it. Can't tell you how many suitable gifts I've purchased over the years only to later find out they sit in a drawer unused, or having been returned.
Not trying to sell you on the idea of the iStick. But, given the form factor, size, battery life, this thing is an amazing piece. I do like it for those reasons, it has more than enough power, and battery life to last me over a full day and then some (depending on stress) something my VV didn't have. I am hard on my gear that I use at work, and I still use both of mine to this day, mt iPV will likely remain at home waiting patiently.Many have found using the EGO-to-510 adapter suited the thread/pin issues worked very well. Personally I didn't care for using the EGO 510 adapter and a beauty ring to help prevent thread issues.
I foresee that this will be the year of ultra small box mods. So if you are so inclined to find something you deem to be a suitable device, return or sell the one you bought and wait for one of the many new devices to hit the market. Although I am sure we will find issues with those as well. Or let her see it and let her make the decision herself. Either way I'm sure both of you will be happy in the end and that is what matters most.