My first Tek-Point was one of the early ones and had issues like many others have reported. First Texas honored their warranty and sent me a new one that had a circuit board update. I liked it so much that I bought a second one too. They are still going strong after almost 5 years. They like rechargeable batteries and at least where I detect most often in high iron mineralization, they are by far the deepest. I can depend on 4" of depth on a US coin sized target. My Garrett Carrot gets half that on in the ground targets.
Since they are pulse induction instead of single frequency VLF, air test results don't tell the whole story.
The F-Pulse and Tek-Point are pulse induction waterproof pinpointers. They were specifically made for salt sand, saltwater and moderate to high iron mineralization. They don't play well with pulse induction detectors. They also need careful use around simultaneous multi frequency detectors. Since those are the kind of detectors I use, I make sure to have my Tek-Point turned on when I do a noise cancel on my Equinox 800, Equinox 900, Legend or Deus 2. I also don't put my detector's coil near my Tek-Point when I am recovering a target.
They can be twitchy but they are super sensitive for a reason.