Echo is cool, it can be pretty useful, but it hasn't realized its full potential yet.
I bought the Tap as a portable speaker to take with me on bike rides with friends. Well I took it out the other day and the minute it lost WiFi connection it just wouldn't work. I'm sure this was a problem on my end, but I had already paired the devices and I wasn't going to spend time fiddling with it while I was out with friends.
EDIT: Also it doesn't happen too often but Alexa has definitely accidentally triggered. It even woke me up at 2 AM after the power went out temporarily to tell me that it had no WiFi.
Its interesting that in the last 30 years we've gone from unworkable text adventure interfaces to the same unworkable interface in verbal form instead of typed/read text. A lot of his story reads as a parody of an Infocom game but spoken instead of typed.