Vulture Ice systems tip up alert system

Anyone have any experience with these. I saw it on outdoor Wisconsin and it looks interesting. When I searched them out found to be a bit pricey but if they work as well as they say (upto a mile) they might be worth it.

https://www.wisn.com/article/made-in-wisconsin-vulture-systems/30660588

Thanks for your input.

I also noticed that since I started using them, I get to flags much faster, and as a result I seldom get a deeply hooked fish. I can only assume that due to this I have greatly reduced potential mortality on released fish.

Been using them for the last 4 years or so, work great! The owner Gregg is a great guy, and is always there to answer questions. I originally bought 2 sensors, but have since bought 3 more. My friends were so impressed with them that after seeing how they worked bought some of their own. The 1 mile range is no joke,  I regularly run tip ups a half mile from where I'm jigging and never miss a flag.