I was very skeptical about Perky-Pet's "Our Best" feeder product claim.  I purchased feeders from local home improvement and chain stores and all leaked, failed or lasted only one year.  At first, the hummingbirds were reluctant to use the Perky-Pet 209 and I almost sent these feeders back.  Once the hummingbirds got used to the feeders they swarm them in the daytime so I purchased two more.  They do not leak so far and have lived up to the claim as Perky-Pet's best feeder.  The 30 oz. glass works best for me because the liquid food will last 4-5 days before being empty.  Once they learn where the feeders are located, they will chase each other to dominate them.  Amazing.  Give one a try.  If you get the same results, you will buy more.  Be prepared to make a lot of food for them during the season.  Good luck.