Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Glass please!

I've a half dozen of the 32 oz Best-1 feeders. They work great, one of the best out there. And I've maintained as many as 20 feeders at one time.However the plastic 72 oz bottle is worthless. Flimsy. Deteriorates in the sunlight, cracks, mount's flimsy. Plus in the high winds here in Prescott, AZ, it swings in the high wing, slopping out juice.Switch to glass and I'd buy half a dozen.Is somebody listening at Best-1? Why don't you have a website?