I've only every had one problem in years of ordering from them, and it was when they left one item out of my order. Customer support was super easy to work with and they fixed he problem for me quickly!
Yes, I received a set of four Dexter glasses and one of them was broken. I contacted them and they immediately set me a new set of glasses, and said I could keep the unbroken glasses from the original set. Great customer service!
The zombie family window stickers fell off of my boyfriend's care in like 2 days, but I haven't had a chance to call them about it. Really disappointing since everything else I've gotten from them has been great.