3 stars: Ok for signal strength, not good at drawing maps. I walk in a straight line, turn 180 degrees and walk back. On the map I see two curves in a V-shape. A different app reads my compass perfectly, so this had nothing to do with wrong sensor data. The app is just not using the sensors right.
2 stars: Potential, but still seems like it's in early beta? Find it interesting the limitation placed on the free edition. Makes it really difficult to tell if the paid version would be worth it. Barely took any sampling before it hit an unpaid limit. Was inconsistent in giving the AR info, sometimes nothing would come up. Camera froze forcing an app reset. Might be useful if the bugs get worked out. Using a Pixel 6 Pro.
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