Yeah, they're trying to be too modern - no instruction manual, minimal verbage on the box, etc. It has backfired on them. It currently has a 2.5-star rating on Amazon out of nearly 200 reviews. As far as compatibility goes, one review summed it up nicely:
I have also grown to dislike the Lutron Caseta switches from a usability POV. They work fine, but I like flipping a physical switch & always have to fumble for a second or two to find the switch & press the right button when I go into my bedroom. Not that it's a major hassle or anything, but because it doesn't have a lever that sticks out, it makes it hard to find in the dark. And I'm not going to pull my phone out of my pocket, slide to unlock it, open the Wink app, select the light, and turn it on just so the light can be on before I go in the room, you know? I would definitely like to see a traditional flip-switch with a smart relay in it.
If Samsung follows their usual copycat routine, then hopefully Smart Things will address the problems that Wink has in the same way the Galaxy phones have addressed what was previously missing in the Apple phones (waterproofing, big screens, removable battery, removable memory, etc. - or in our case, offline usage, less buggy GUI, broader compatibility with existing equipment standards such as Zwave, etc.).