The life is so much worse than indicated by the manufacturer. Although these spots make a very nice light and are comparable in brightness to a 35W halogen spotlight, I can only strongly advise against the purchase of the sad life!
I have, for comparison, competing products in use (for example, 10 pieces of brand spots "Megaman", some of Osram), which have about 4 times the operating time behind him - and so far without a single failure!