The most troubling pattern you see in the one-star Amazon reviews is the reports of battery life declining (or failing) over time. This is part of a larger trend in baby monitors in general, and our take on it is that the battery tech within these monitors is just not at the level people have come to expect after living with good phones and tablets, and other quality electronics. Reading the negative reviews on this and many other monitors reminded us of the kinds of problems people had with rechargeable batteries years ago. Here’s a good example of what we mean. So for now, for any baby monitor, set your expectations accordingly.
If you're looking for a smartphone-compatible baby monitor that's designed first and foremost to fill that role, Wirecutter calls the iBaby M6S (Est. $135) "the least bad Wi-Fi monitor (so far)," simply because it's "slightly easier to set up than its competitors." Once again, however, experts disagree: Baby Bargains says Nest Cam "runs circles around iBaby when it comes to set up and ease of use."