Well, I have an array of echo's, dots, and the new spot (seven devices in all). I have to say, in my experience of having it now for about two months, it's a very expensive alarm clock.
I used the screen initially for calling my sister in Yorkshire (she has an echo show) but the screen is so small you really cannot see an awful lot unless you are extremely close to it. It's very like Skype although the sound sometimes goes awry (even though I have a superfast broadband connection). I have two cameras on the system, but again, the screen is so small it is really hard to see anything unless you are close up. I tried to call my friends in the US who have echo's but it wouldn't work; Amazon tell me it only works with people in the UK who have a device in the UK or have downloaded the app onto their mobile. I'm assured that national calling to landlines and mobiles will be coming soon (as they have in the US) but no dates as yet.
All in all, i love the spot as a device and the concept is great BUT, for me, it is a just a very expensive alarm clock now and has been assigned to my bedroom (with the camera disabled!).