This tumbler is really nice overall, and I liked that it wasn't awkward or uncomfortable to hold. Unfortunately, though, it's not very practical for taking in the vehicle, which makes transporting it difficult. I prefer a cup that I can use at home and then grab and take with me when I leave. Having to switch to a completely different cup just to go somewhere is inconvenient.
The straw was also a major issue for me. It was so small that I felt like I had to suck really hard just to get enough water through it, and even then, it felt like I was barely getting any drink. I ended up replacing the straw, but even after doing that, it was still awkward having to keep switching everything back and forth between home and work.
Unfortunately, because of these issues, this just wasn't a mug that worked well for me. I really wanted to like it, but I need something that's more convenient for everyday use and easy to take on the go.