It has been a long time since I have been using amazon echo, and now I am going to share my own review about amazon echo.I really had an terrible experience with it.I was really very disappointed due to its performance.The main disadvantages of amazon echo is that we need to always keep it connected with the socket, There is no battery backup available in amazon echo.It does not have any display to show visual images like graphics or maps.It must be always plugged in since it has no internal battery.There is no option to Change the language as it only speaks one language i.e.English, Sound performance of amazon echo is not much good and not much impressive.It can only answer factual answers, basically the stuff that you can find on the heading of wikipedia page or with google answers, it does not provdie you with complete information.Some of the limitations of amazon echo are as follows.
1) .There is always a stake at your privacy when using echo as others can also access echo conversation.
2) .It takes a very long time to update echo.It takes several days to update the new version of software into amazon echo.
3) .Sometimes, It can be bit slower while responding and can provides you with false information which can be confusing and annoying.
4) .Amazon echo is really very costly.Not everyone can afford to buy it.
5) .Sometimes its sound quality can be hazy with unstable audio which can be bit annoying.
FROM MY PERSONAL EXPERIENCE I STRICTLY RECOMMEND NOT TO PREFER AMAZON ECHO.