The upper bowl on mine is very heavy. The lower bowl that collects the grindings is probably tempered glass but is very thin. As long as one does not pound it against a stone countertop, it seems strong enough, though.
Yes, I agree. I think it’s as good as the one two and three times more expensive.
http://www.ebay.com/itm/like/191920871720?lpid=82&chn=ps&ul_noapp=true