I prefer to use the plastic feeder types. I have had so many of the glass feeders. And, without a doubt, I would break them either by dropping accidentally in the garden or while washing them at the kitchen sink. I gave up on them. Too expensive to have to replace and hard to clean.
I found a unique plastic feeder last year, on line at the Cornell Lab of Ornithology website "All About birds",that is eco-friendly in that it re-uses plastic beverage bottles as the nectar reservoir. It has a very easy to clean feeder base, I don't ever have to clean a reservoir bottle (just re-use another plastic bottle when I change out the nectar), and I don't have top worry about it breaking whenever I happen to drop it.
If the nectar is changed every 3 days or so, in my opinion, the re use of plastic bottles are safe for the birds. If humans can drink liquids from them that has been sitting on a shelf for 6-months to a year, I firmly believe that 3 day old (straight sugar and water;1 part sugar to 4 parts water) nectar is perfectly safe. And, from what I have seen by the birds feeding from my feeder, "They Love It!". If anyone is interested in the feeder I use, let me know and I will post the site name for it.
Chirp, Chirp!