Really good for keeping track of both my activities and sleep. Unit did malfunction many months into use however the team were really helpful and got another unit out to me very quickly and was easy to deal with on my end.

First of all I can confirm that the support is responsive and very friendly. My device had stopped charging and they sent me a replacement device immediately. They will record a video call during this process, but will delete the video upon customer request and data privacy concerns. The device itself appears to be quite accurate at rest or during sleep. The live ECG shows clearly visible premature contractions coinciding with felt palpitations and you can easily tell whether they’re of ventricular or atrial origin. That shows me that it is clearly not recording fantasy data, but your real cardiac activity. It also accurately diagnosed episodes of atrial fibrillation. Those details are also visible when moving, but the overall ECG will show noise from movement artefacts, so that the ECGs are not so useful to identify details beyond heart rate & rhythm. At least I haven't yet found a way to interpret them otherwise. I assume that movement is a challenge for such a small device and I had been searching for an ECG tracker for quite some time. This is by far the best device I’ve found so far. The team is quite active and appears to be keen on constantly improving the device. I’ve received a couple of firmware updates & one can expect that the device gets even better with time.

I've had challenges with the firmware, and every time I call the support team, they're prompt, easily accessible, and very helpful. I purchased the device after an aortic valve replacement, and it gives me peace of mind while I continue to train at safe levels. My cardiologist also agrees that the device provides valuable feedback.

very good support service. had a problem with the device not responding any more. Fast answer with good instructions to resolve the problem. good monitor with a lot of information for training. heart rate much more appropriate than the sport watch.

I have used Fourth Frontier for over 1 year. It provides much more information than Apple Watch or Whoop, both of which I have used. When I had problem charging the monitor, Support was on the phone with me to resolve the problem, and then followed up to ensure that the problem had actually been resolved.

I have had a Frontier x for over a year and it has been invaluable. I have atrial fibrillation so I have used the device to see how my heart is doing and how training affects it. My cardiologist loves it as it gives information way beyond what can be provided in a short ecg or even a week or two’s holter monitor. Customer service has also been excellent. The device recently developed a fault and was replaced without a quibble. I wouldn’t be without it.

I had an issue wiht my device not charging and once i email support it was resolved right away. Great product

FrontierX have produced a product that enables you to train effectively and monitor the health of your heart. I purchased the device to monitor my arrhythmia, acquired from possible overtraining. I wish I'd had the device early, as it could have prevented damage to my heart. FrontierX are accessible and provide excellent backup. A must have device.

Great support when seeking help related to an issue with the device.

Love the HR monitor, using it for running cycling walking mainly for over a year. Used it to work out my FTP and even impressed my GP. Taking back control of my health from the state and industry.