On first impression I really liked the silicone sleeves with the handle. But I thought the glass seemed pretty thin and had a feeling that we'd have at least 1 broken by the end of the first day. I was only a little wrong. It took 2 days for the first one to get broken. One of the twins took it outside and it fell off their slide. Within a week 2 more were broken, on purpose by the other twin who took them outside and threw them on the cement on purpose to watch them shatter. So we now have 1 unbroken, and 3 empty sleeves.
Although I did like the idea of Kupp, I think they are better suited to kids 5 years and up. Little kids are just too clumsy/mischievous for fragile glass cups. My older boys had no problem keeping them intact and are always careful with our last unbroken one. I like that the Kupp and the sleeve are dishwasher safe, and you don't have to remove the sleeve to wash it. My older kids like using a glass instead of the plastic kid cups too, so it makes them happy to have one of their own.
*Disclaimer: I received this product free from Moms Meet to provide an honest review. All opinions are my own.*