I found the idea that it could be always listening to you creepy at first...but if you think about it your mobile phone, landline phone, computer microphone and more could be hijacked to always listen to you as well so there isn't much difference.
While on Echo, you are just a part of the Quality System and Eris knows what they'll do with all that information in the future. Algorithms and AI is there to sort it out.
I find it creepy but what creeps me even more out is people who don't find it creepy.
I'm not saying your making the wrong decision, it's a trade-off that everyone needs to make individually. If your happy with your Echo, great! But just because someone has one attack-vector on you doesn't mean you should dismiss new attack vectors.
The Echo is an unlikely device to be compromised and recording everything you say, because it's pretty locked down and definitely not a general purpose computer.
> it's pretty locked down
source? AFAIK you can't verify what it's doing, so it doesn't matter how well it's locked down.