Generally speaking, it's never recommended to purchase electronics from online stores even if they're offering warranties/money-back guarantee. The best way to buy such stuff is from your local market and your sources must be trusted so in case if the stuff gets screwed up, you can easily RMA it.
I don't recommend to import stuff from Amazon/eBay or similar sites if you're getting the same thing in just few bucks more. Because if the equipment is faulty then returning will be a pain in the ass.