I have not used that app. I've bought or tried many free weather apps. I've found exactly two that allows you to choose your own weather station (if you upload to WU) and I use one, and that's the Wunderground's official app, which is my go-to wx app. Other apps get data from WU, but they choose what to pull, usually automatically based on GPS, or by the city you select. No feedback as to whether they're pulling from PWSs or only gov't approved sites.
The 3 weather apps I keep on my home screen is
Wunderground's,
Solar (beautiful, fast, WU sourced), and
Dark Sky, which is fun to see if it can accurately guess when precip is going to start and stop. Additionally, I use
Living Earth HD as my bedside clock, which also pulls often-updated WU wx data, plus has a cool live cloud image. Has a nice night-dimming mode too, so its made to run all night.
I use all of these regularly. The runner up, still on my phone is
Clink Apps Weather, but it's way in the back and almost never gets used. It does, however, allow you to choose a specific wx station.