Let's you see nearby wireless networks and channels they are on for your own wifi planning purposes. However, since it's "cloud-based" (meaning on the web) and offered for free, might they not be sniffing around for wifi information and populating a database.
It wouldn't affect your wifi security, but it's kind of like when google was recording wifi information. The difference being you have to launch this yourself.
I guess what I'm asking is: Is this the sort of tool that you should pause to think about before using and voluntarily revealing your company or private wifi information?