If it isn't a pricing error, and the stock is still readily available from the supplier the wheels tend to turn smoothly with RARU.
The issue comes in when they have to give you your money back due to lack of stock or pricing mistake. That's when the wheels fall off.
If you're okay with taking store credit if they fail to supply your order, you should be okay. Otherwise be prepared to wait a long time to get your money back, especially if it's a larger amount.
ProTip: If you insist on ordering an expensive item from them, pay using your credit card. That way if they do try to pull any delaying tactics, you can reverse the charge.