I spent a lot of frustrating moments in past Christmas's climbing ladders to fix light strands that went out due to water infiltration. I finally found these earlier this season which have sealed bulb sockets to prevent water from getting in and shorting out the strands. So far they have held up well to two snowfalls and melts which would have played havoc with the cheap Sams Club brand lights I had in past years. If they make it thru this season and the beginning of next, I will order more to do more parts of the house. So far so good!

Pros: sealed against weather and water infiltration
Cons: not very long (7' lighted per strand). pricey for the length/number of lights