UPDATE:
My bottle actually just broke! The base of the inner glass completely shattered while walking home with it in my backpack. I didn't set it down hard so I'm not sure if it was just the constant walking with it or what, but it was quite alarming to see and I'm glad I was paying attention when I went to drink from it. I've contacted Soma about it today so I'll update my review based on their response.
Original:
I've been using this for almost a year now, and it's still working well. I'll echo what davidly said, the strainer works great, the insulation is just okay. I normally finish my tea before it's too cold to drink, unless I get distracted, so it hasn't come back to bite me too often.
I also take the strainer out after I'm done steeping, so I don't run into any of the drinking issues with it in.