This same reviewer also thinks that Perky-Pet's 210-P with the hourglass-shaped glass bottle (and similar feeders) is unsuitable because you can't get a bottle brush into the "shoulder" of the bottle. She feels that the main criterion in selecting a feeder is that it be easy to take apart and clean. I agree with her completely.
I no longer recommend products from Perky-Pet, due to their recalcitrant position on powdered mixes containing red dye.
69 North Locust Street
Lititz, PA 17543