I order from tenda infrequently, usually I get say a year's worth of ammo and so far no issues whatsoever. Prices are usually pretty decent, although I always laugh that 1 week after my order arrives, I see SFRC will undercut whatever I paid.
Now I have had the odd issue with a complex order, or a potential shipping foul up, bound to happen after about 8-10 transactions over the past decade or so, but the customer service people have always been helpful and speedy to respond to
my questions.... I have no probs with these guys.... Overall, I have been pretty lucky, very few total screw ups, but ya it certainly happens.....