I am revising my prior review of "Durable and long lasting at a great price."  The price is great; so great that other bulbs cannot compete in price.  However, my last batch of these bulbs did not last as long as one would/should expect.  My application is 12 volt landscape lighting, using 80-90 percent of the transformer wattage.  Some 12-packs of these bulbs seem to last longer than others and I can only attribute this to slight differences in manufacturing runs.  My last batch lasted roughly four months; previous batches have lasted six months.  This seems to be a cyclical issue, i.e. sometimes they last awhile and sometimes the don't.  But, for the price and as many fixtures as I have running all night, these are the only reasonable cost choice.  There are so many variables in various applications, so they may last longer in your situation.