Although I think these do benefit some, Ive never found that they keep the bees away only at bay to some degree. They are a bit of a pain to clean and I always find that I damage them ore by trying to do so. Ive replaced mine a few time now..

Pros: helps keep some pests out

Cons: not overly easy to clean

I dont think they keep the bees away, they do brighten the feeder but the weather really takes a toll on them

Pros: brightens the feeder

Cons: need to replace often

These only last so long and need to be replaced. Much less expensive than buying a whole new feeder.

Pros: Easy to Replace

Cons: Hard to Clean