Bests & Worsts Reviews from Amazon

First, the customer support for US Acrylic is excellent, and if I was rating the company rather than the product, I would give them a full 5 Stars. I received the glasses, used the large 18 oz glasses for water only, hand washed, no hot or cold temperatures, and within two weeks, two of the glasses had cracks in the bottom bases of the glasses. The 14 oz tumblers seemed in good condition, and the cracks did not go all the way through the bases, but my wife and I were afraid to use the glasses in case the cracks worsened. I contacted US Acrylic, and they very readily offered to replace the whole order. While we were waiting for the replacements to arrive, we discovered that one of the two remaining 18 oz glasses also developed a long narrow crack in the base. Considering we don't dishwash or even remotely roughly handle the break resistant glasses, 3 out of 4 cracking is unacceptable quality.