I own one, which is collecting dust since I got a Joule. I had one of the original models as well, but I gave it to a friend.
My unit had trouble pairing to my phone, and despite not being plugged in for months, I occasionally get messages about it's temperature. I'm reasonably sure the messaging has been messed up and I'm getting alerts on someone else's unit.
The main reason I have shelved it is that it spontaneously turned off in the middle of the day on a long cook.
I love sous vide, I have great admiration for Abe and Lisa Futterman, and I think they're book is pretty good. But I would never buy anything from them again. Their hearts are in the right place, but their execution, delivery and product are not up to par with their competitors. Anova and ChefSteps make better units.