We ordered the mattress and cover combo via Costco. We figured that way we'd always be able to return it. After two months I have to admit we love the Sleep Eight. The mattress they offer is comfortable. Not too firm or soft. If you are a particularly heavy person, you may want something with more support.
Now on to the cover. My wife and I have had issues sleeping over the years, and this has been helpful for us to see what's keeping us from sleeping. The app only tracks room and bed temp, along with heart rate and breathing. If it tracks other sleep data, I don't know how to get to that data. If you are up for a long period, you get "session 1" and "session 2" scores. I don't know what to do with that, add them and divide by two?
In fact, the reason for four stars is that the app seems to need a bit more refinement:
1) It doesn't tell you what to do with the data.
2) If you are having issues with your partner being visible, there's no real help to solve.
3) If you like to cuddle in the middle of the bed, it has a hard time figuring that out.
Other than that, I love it.
Bottom Line: Yes, I would recommend this to a friend