I find mine works very nice.
The charging box/container is a repeater. It can be approx. 20 feet from your probe in your meat. And then approx. 200 plus feet from that with your phone.
Mine works well so far , only used it a few times so far.
Mine is in my Smokers Shack. Wooden shed with my smoker inside. I was in my house and in the back yard on the other side of the house 100 plus feet from the smoker. And still had a connection.
I also like that you can set a pre alarm , say I wanted a finish temp at 145Deg. and I set that. I can also set a pre temp at 135 so I know to get ready and drop what I am doing to get ready for the final countdown, lol
I really like this unit. And they are talking about an add on of a wifi upgrade. Which I hope they do as some times I have to run up the road to pick up items I forgot for a meal
Just my experience so far.
David