Perky-Pet makes all sorts of hummingbird feeders, but I think this simple style is one of their best designs. This is a new model, but it has all the important features I look for in a quality hummingbird feeder--glass, easy hanging (S hook), durability and no leakage. I like this particular feeder because the wide mouth makes cleaning and filling easy, the base separates in half (again for easy cleaning) and it has built in bee guards and an ant moat. Most important, hummingbirds like it. We have over ten different feeders hanging around the yard, and it's obvious which ones are preferred. Their favorite feeders aren't the fanciest or most expensive, but they all resemble this fundamental glass tube style.
Skip the decorative feeders that look nice but attract few birds, and get back to basics. This 30 oz. model feeds a lot of hummingbirds. If your yard only has a few birds, I recommend a smaller Perky-Pet model with similar features, like Birdscapes 279 Deluxe Rose Petal 12-ounce Glass Hummingbird Feeder. It only holds 12 oz and doesn't have a base that separates, but it's still easy to clean and hummingbirds around here swarm to those too.