I know the Echo has been around for a few months but I just got one after pre-ordering back in January. I've had it for a couple days and used it for one so these are some thoughts based on a very limited amount of usage

1. Setup requires a wifi connection - this is kind of annoying. I had it shipped to the office and our enterprise wifi encryption isn't supported on the Echo so I couldn't play with the device until I got home. It would have been better if I could have quickly paired it to my phone with bluetooth and started playing some music through it.
2. Setup is easy - however, once you've got it on wifi the setup was super simple and super painless.
3. Voice recognition is pretty good. It had trouble with only one thing I've told it so far - "add IPA to my shopping list". It just couldn't handle the letters IPA. I tried four times and the best it did was IP-eight. Other than that it has handled all of our other queries with aplomb.
4. Can't integrate with any music services I use. It uses amazon prime music and will let you integrate with some other stuff like iHeartMusic and tunein - but I don't use any of those services and doubt I will really. The amazon radio stations interface on the web/phone sucks. I already subscribe to Google Play music so it would be nice if I could natively integrate with it but the best I can do is pair my phone with Bluetooth and play my music that way. The problem there is that I lose the nice voice integration. On the plus side my wife does like Pandora and Echo recently added support for that so I'll try to set that up for her.
5. It looks nice - i like the unobtrusive look of it on the kitchen counter.
6. The echo app on my phone is slow - Because the echo basically only integrates with my phone via this echo app and the app is kind of clunky I'll probably not use the Echo much for shopping lists etc. We already use Google Keep for shopping lists and googles voice recognition is just as good, if not better. In the end I suspect this device will go into my eldest daughters bedroom to serve as a Bluetooth speaker.
7. The speaker sounds pretty good - I'm pleasantly surprised with the sound quality. It's clear and the bass is solid. I'm no audiophile and for my needs it sounds fine.
8. I don't think the device has a rechargeable battery so it is tethered to one room in the house.

I had hoped for a little more integration so in the end I'm a little disappointed with the device. Interestingly once you buy one it seems you can't buy another (not that I want to) but when I go to the amazon website I only get a "thanks for your purchase" note and no option to buy another. If you're interested in buying one you can get them at via this link at Amazon.

NOTE: When I bought mine it was $99 for Prime members. Now it is $149 for Prime members and $199 for anyone else. I think that the $99 price point is where it should be for everyone.