Glenn and the guys at TGA are very knowledgeable when it comes to grain drying.and monitoring. They are constantly improving their product with updates and add ons, and if there is a problem with a sensor or cable, it is repaired almost instantly.
The app is getting easier and easier to use as time goes on, and is very accurate. I know almost instantly when my grain is starting to get warm. That alone makes the TGA products worth it.