I have had my Whistle Go Explore for several weeks so I feel confident enough to write a thorough review. I was extremely skeptical of this type of technology but I took the leap and I’m glad I did. I also bought the collar Whistle specifically makes for housing the GPS/Activity Tracker.Right out of the box, it is ready to go. All you have to do is download the whistle app on your phone, charge the device, and navigate through the initial setup—all done through the Whistle app. Setup is super easy and relatively quick. **Whistle does require a subscription**. That may seem like a draw back but it’s no more than $5 a month. For me, it is worth it for the peace of mind if my dog gets lost.Pros:-durable. The device does show wear after some extensive play but it is purely cosmetic. The plastic used is very strong, light, and water resistant.-accurate. Device is accurate the vast majority of the time. I have ran into some issues where the app took an extensive period of time to load and track his location but after a period of a minute or two it was back working as usual.-easy set up.-tracks fitness levels and sets goals based on weight, age, and breed-tracks scratching and licking. EXTREMELY useful feature. The device tracks how many minutes per day your dog scratches or licks and compares that to a baseline average. If your dog licks or scratches more than usual, the whistle app will notify you. Really useful during flea and tick season. Increased scratching might mean it’s time for a flea treatment.-LED light. Pretty cool feature. LED light is fairly bright at night. It has slow and fast strobe as well as a continuous on mode.Cons:-device does show cosmetic wear after a short period. It does not effect the function of the collar.-Rare connectivity issuesTo summarize: if you are looking to simultaneously attain peace of mind in the event your dog gets lost, track your dogs health, and have a LED light to use at night this is the collar for you. It’s durable, the subscription is not that expensive, and the Whistle collar is perfect for mounting the device. You can use your own collar with the included mounting attachment, but the collar with the receiver specifically made for the device is metal and super strong. The buckle on the collar is also metal. The little loopy thing that you attach leashes to is also metal. It’s nice :) You won’t be disappointed.