Not at all. I had Marth, Villager, and WFT pre-ordered there (before they stopped taking preorders) and they cancelled on me leaving me high and dry. I cancelled the rest of my Amiibos with them.
That said, I've ordered tons of other stuff from them and before that they were reliable. I would NOT place all of your faith in them for Amiibos though.
I am kind of expecting this from any retailer, I meant more among the lines of the condition the package arrives, the costume support, etc.