(This is for their online service)
I recently ordered an Avacyn Restored Fatpack and it was accidentally shipped to the wrong address, through my error (I believe). At first I emailed them and they responded in a quick manner and it was very informative. I called them to check up on the status of the package and the staff was so friendly about it, they changed the shipping address to the correct one without any additional charges!
They have an amazing selection and great prices compared to other places and I will probably order from them again when I need Magic: The Gathering cards. The interface is simple and they have a huge selection of items besides MTG cards.