Absolutely superb product with customer service second to none.

Very responsive to problems I have been having with my unit. I look forward to having my issue resolved. I have been using my X2 almost for a 10 months issue free- great for people who like to push it hard during cardio, and to be cognizant of needed recovery. Like it so much I bought 2 more for my parents to wear.

I recently removed my HRM without stopping the activity in the app. I noticed that the data of my activity had not been automatically synced to my activity history. I contacted Fourth Frontier and they helped me with retrieving the data. This company gives superb support everytime no matter the issue.

Its a super impressive product. Then I was really impressed with the onboarding as I am not very technical.

I've had a Fourth Frontier X since December 2021, the service and help from Fourth Frontier has been excellent from the start when I had a slight problem with the chest strap and they sent replacements immediately. I raised an issue with the web interface recently and had the same experience - they were straight on it and fixed the problem. The hardware itself is really very good. It seems to get frequent firmware updates and performs as well now as it did when it was new. The quality of the data coming out of it is excellent. I've recently upgraded my running watch to a Garmin 245 which has the correct Bluetooth capability to connect to the FFX, this is great because I now have reliable heart rate on my training records as well as the ECG traces on Fourth Frontier's dashboard. If you have an odd heart rythmn and are interested in monitoring it, this device really does do what you need. Oh, and of course you can set off an ECG and share it with your cardiologist live. That is a really cool feature.

Been using it for around 2-3 months every day and it's a great product, does exactly as advertised. Customer service is top notch as well!

Overall really happy with the device and app. The service team at the frontline is dedicated and responsive....which was tested after the ECG keyboard navigation on the web app stopped working properly. Fixing it took 'forever' but eventually got done. There is room for improvement on the ECG reporting side, e.g. please include better analytics...should be very straight forward if AI supported...useful metrics would include: total beat count, count of PVCs, PACs, bigeminy etc ..adding those report metrics would make this an outstanding device & heart health ecosystem....and certainly turn this into a five star product and experience.

Amazing customer service. I have had some issues with device turning off and not recording sessions so isn't full proof but their help always is.

I have been using the device for my workout to assure that I ado not exceed 120 HR set by my cardiologist. I find that it’s the only device on the market that tracks critical data without the need for you to stop and wait and alerts you if you exceed set thresholds. Customer service is very good and receptive. I would highly recommend this product *****

I have become almost addicted to my Fourth Frontier app these last 60 days. I am a 66 yo man with several chronic conditions. A healthy diet and a robust exercise regiment are essential, On Monday, July 10 , it appeared I had lost my 4 mile activity. On Tuesday I emailed Fourth Frontier to see if they could restore my July 10 activity. Sneha responded back to me within 60 minutes - indicating that she was working my issue. I did not expect that level of service. By Wednesday,,July 12, my July 10 activity had been restored. These guys and gals are the best!?? Chris