But I don't like paper, wood or plastic palettes (does anyone?)
Yeah, ....I really do!
My reason for liking a wooden palette is that I have found that it feels terribly inconvenient for me to mix my paint at waist level. I simply have to have a palette in my hand for dealing with paint, because I like to have that operation closer to my face than a waist-level palette provides.
I like the idea of glass, though, because of the ease of cleaning it, but a glass palette is very heavy when held in the hand.
I don't like paper, or plastic, particularly for a palette, but glass just isn't for me, either. Too heavy, and can't hold it in my hand.
If I did favor glass palettes, I'd say you got a rather good deal on that one, though.