Hello there!
I own a bunch of these plushies, actually (and quite a few other people do on this forum!). They are actually bootleg unofficial plushies, so keep in mind you would not be supporting Hasbro in any way or form if you get these.
In terms of legit (getting them) that all depends on which seller you buy from. Do go by their seller rating and feedback to judge for yourself if others received them. It looks like they have a great amount of positive feedback, so you should be good. I only had one problem from a seller (I use zzanime or something along that name) - and that was the fault with them, which they resent another pony.