I bought the warm white and bright white sets, for inside and outside Christmas trees. The bright whites unfortunately burnt out as soon as they were plugged in, giving me a bit of a fright, but I contacted the seller who replied almost instantly and promised to replace them. I received the new set, in good working order, within 2 days and wasn't required to return the faulty set which was a relief as they're quite heavy. Customer service was excellent. My only concern is the short length of cord, as for outside use they're not going to reach the house but I have an extension cable which accommodates and weather-proofs plugs.