Bests & Worsts Reviews from Amazon

I am so disappointed that I could NOT reproduce the failures described and/or shown in pictures by other reviewers. I loaded the tumblers in the top rack per instructions, set on high-heat, and they made it through without warping, cracking, or separating. I also tried to get condensation on mine, but no luck. Just dry and somewhat cool on the outside, but no moisture, even in a steamy bathroom with a fogged mirror. Then I tried the ice test. Again, sad news: the ice lasts a long time. I was able to get it to melt fast if I poured a room temp beverage over the ice, but if it was a cold drink, the ice lasts hours, at least indoors. Then I tried the same thing outside in the Las Vegas heat and discovered that when it's hot outside (95° or more) the ice melts faster! Even faster in the sun! Wow, what a surprise. I have an insulated metal cup which keeps ice better, but it doesn't look as nice as these tumblers, and I hate the taste and feel of the metal rim when I drink out of them. Plus I cannot wash that metal one in the dishwasher or the paint comes off. So, since mine are working perfectly, I'm must (regretably) rate them 5 stars. Seriously, tho, I'm pretty impressed with these so far. Downsides: -somewhat pricey -they are large and can be difficult for my wife to hold; I'll need to get the smaller size for her.