I have only been to one Teavana store, and it has been both nice and not so nice.
Though I will say I probably would not be on this forum, and as into tea as I a now were it not for Teavana.
But I have had many good experiences where sales clerks have approached me and if I had a question I asked, otherwise, I said I didn't need any help right now, and they would leave me alone.
Though I have experienced some of the bad parts about this company, once when I was ordering a tea, they automatically put the tin on the Scale, to which I was paying attention enough to tell them that I did not want a tin.
But the worst thing that has happened to me in one of their stores, is I was in the middle of placing an order for tea, and (I don't know why) but I wanted to try Gunpowder green tea, so I asked if I could get two ounces of it, at which point another person at the counter tells me, 2 oz is not that much because its a pretty compact tea. Which I was completely not thinking at the time, because you really should be brewing tea by weight not any sort of measure of volume, but they talked me into buying twice as much as I wanted, on an absolutely horrible tea. Something I probably would not have minded if I actually liked the tea.
So I will go into a Teavana from time to time, they do have nice canisters, and certain other tea accessories. But should I actually get tea there, it might have to only be their unflavored black teas (should they still carry any of those).