SmartThings, which is owned by Samsung, will presumably be joining Belkin WeMo, Philips Hue and Wink smarthome products that work with the Amazon Echo. And these all work quite well. I have a Wink hub connected to my Echo so that I can tell Alexa to turn lights on or off in different rooms of my house, for example.
How to turn Amazon Echo into the brains of your smarthome
When Amazon Echo first launched, I passed on the product simply because I didn't need another connected speaker. Google Now and Siri were also more than capable of providing other useful information through voice queries.