Oh god, this just keeps getting better...
If you ordered it when they were out of stock, don't get pissy when it takes them a while to ship it. Common-fuckin-sense.
I've never seen any reports of anyone being scammed by them. Just people calling them scammers for accepting pre-orders for a device that may or may not be coming out anymore (Wiikey U), and dumbasses trying to ruin their reputation because their order didn't ship right away (See above).
TLDR: If you're ordering something that's in stock, you won't have problems. If you're pre-ordering something, or ordering when they're out of stock, be patient and/or accept the fact that they charge a restocking fee for cancelled orders.
Wait... they charged a restocking fee on a pre-order? That's pretty shady.