We just recently ungraded to FI Series 3 for our dog Stanley. We wanted a different collar and not many companies are up to speed with the series 3 yet. This collar is the best we’ve had! Its design, style, and security is top notch. The FI gps was easy to install. Very fast customer service through text as well. Highly recommend. (Here’s a pic of our lil guy Stanley! Hard to see the entire collar because of his neck jig lol)