As above, try it out, when you try it in a brick and mortar store, make sure you BUY it form them too. If you aren't willing to take the punt online without risk then at least support their service with your purchase.
No, things to consider.
How much shooting do you do in portrait orientation?
How many time do you change your battery mid shoot?
I have a grip and rarely use it, I want it for those shoots where I know I need it, but most of the time it sits on the table unused.
I doubt your wife will want it, if a larger body isn't comfortable for her, why turn a nice size camera into a larger one?
Don't forget the weight, it adds up too.
C&C always welcome