Funny story, I found Navtool about a year ago and got really excited. If you look at their sales videos, or at least back then, they were openly hostile to the consumer. It was sooo weird. Instead of a video about "hey, check out our cool product", it was "hey, if you buy this and it doesn't work, it's your fault, you are an idiot". I made a post on here about the product, thinking it would be a huge hit. And they actually showed up to the thread to answer questions, but they had very vague answers and timelines, or just plain ignored questions. I have no doubt they had products that worked for other cars, but their claim they had one that worked with Tesla was completely bogus.
So that's why this product seems so cool. I mean, if you were to believe the pictures, it actually does work. And the interface with the car doesn't seem too intrusive at all. I'm a tad nervous about the CANbus interface, but I don't know enough about CANbus as I only use device to read from it. I don't know if this product is injecting anything into the CANbus, that's just a small yellow flag for me. And plus, that would really get Tesla's attention if they were selling a product that did that, right?
Edit: Hey look, my thread:
NavTool Integration
Edit2: I think this person works for them:
almans - but again, he did not seem remotely helpful.