Well, as long as the core product is good it's okay, I guess.
I have yet to hear any of my friends say they've had a positive experience with them. They always manage to screw up somehow, whether it be charging for an item they don't really have or failing to cancel an order you told them to cancel weeks ago. Oh, and when you finally receive that order, they make you pay for shipping back to them despite it being entirely their fault for not canceling it. No, I am not exaggerating on any of this. I'll be even more specific, all of this happened to one of my friends who tried to order a TE from them when they were rare. The rest of the time it's usually bad packaging, slow shipping, being forced to pay shipping for a defective exchange, bad customer service, etc.
I've never heard any complaints about Rightstuf, so they're okay in my book. Deepdiscount is just a nightmare to deal with and not a store I would recommend to anyone.