When I first saw this glass whisking drink mixer I knew I had to have it! I hate drinks that stay all clumped up, don’t mix or settle back to the bottom. I wanted to use it for my new mushroom coffee and creamer at work. Today I tried it for the first time. The rubber on the glass makes it much easier to grip. I used hot water so I left the lid open. Everything mixed well and the container did not burn my hand! It was awkward to drink out of at first but once my coffee cooled a bit I had no issues. My coffee stayed warm for a couple hours, which is all I really need. It was easy to wash. I could quickly push the button to mix my drink up before I took a sip, which made everything taste better! So far, I love it!