Cons: expensive and useless
I bought the GE Helical energy efficient bulbs and 5 yes FIVE of them have burned out. They were in different light fixtures so it is not the fixture. These bulbs are expensive and useless. I tried to save money on electric energy and ended up wasting my money on these 'long lasting, energy efficient' bulbs that burned out faster than the old incandescent bulbs. I will certainly look for another brand in the future.