Works well for me. I got it to use with my old Garmin 310XT which no longer likes syncing using the Garmin Ant dongle. Using this app and the built in Ant on my phone (Samsung Galaxy S5) it was very easy to upload the data from my GPS. You do need to follow the instructions for your specific device. For my device, instructions were to turn off wifi on phone and enable searching for device. I also find if I manually delete the events off of my GPS that I don't want to upload, it increases the chance of success. Love the upload to Strava functionality.
It worked fine with my Montana 600! Saved me carrying a PC on a 3 week Europe bike tour and uploaded my GPS data every day without a PC! (That was with a Garmin Montana 600 and Samsung S4 phone. The best cable is a Lindy #31717 IMHO.) Oddly the most reliable connection was with the Montana battery removed and the phone powering the Garmin in Data mode. Sadly this ease of communication is no more now that I have a newer Samsung Note 4 phone running Android 6.0.1. Carlo explained to me that Android has restricted permissions to removable USB devices such as a Garmin .Now the only route now is to use a third-party file app such as Astro to shift the gpx files to a folder on the phone and then access that via Uploader. It works but is a lot "fiddlier"- hopefully he may find a work-around to restore the previous ease of use in future. Blame Google!
Worked well at first, but now too much of a hassle with turning wifi/data off and making sure gps is on watch is off to get it to *hopefully* sync. I found another app where none of that is necessary.
I don't normally bother with adding reviews; however, this is one of the best apps I've ever used. It has transformed my entire Garmin experience. If you have Garmin upload difficulty get this app!
I've used this app for a couple of years now, using my 310XT. It works great and uploads to Strava seamlessly.
My Garmin forerunner 405 is unable to communicate with this App.
fix for strava + "sign in with google"