What a great device when using on my iPhone in isolation from any other device The big downside, however is be wary as it won’t work /!connect with with Zwift or wahoo via ant+ / Bluetooth which is a huge downside if you are seeking a divine for sport.

I have been using the Frontier X for a few years and whilst I get a lot from it, I have experienced a few minor disruptions. What I particularly like is the speed of responsiveness of their customer support team. They are caring, curious and supportive. They want to help and to be of service. They want to get the matter resolved quickly and are keen to follow up to make sure I am happy. Thank you

As a lifelong endurance athlete, now in my early 70s, I continue to remain committed in performing at the top of my game. I also have a family history of heart rhythm issues and recently began to experience episodes of very high heart rates during exercise which introduced a second challenge of exercising in a safe and healthy way. With the Fourth Frontier X2 I found a very effectiv e way to manage both. First I can share an ECG of high HRM episodes with my Cardiologist no matter when they occur (which is always during a workout). Second, I can identify when I had an issue and relate it to what I was doing at that exact moment, which can help me identify factors that may be triggers. The X2 has several tools that help me plan and measure my workouts. Overall the X2 has been a great help for planning workouts and identifying results. On top of all that, the Fourth Frontier team is very knowledgeable and supportive. So that's it, the X2 is great technology supported by a great team!

This is a magnificent piece of kit and quite unlike other HRMs I have used. Recently I experienced a problem with it and their support were all over it really quickly and I was up and running again the following day.

Having been diagnosed with atrial fibrillation, I was looking for a way to safely continue with my exercise regime. The Frontier X product combined with their weekly monitoring programme have turned out to be perfect for me. I now know much more about how my heart reacts to the stress and strain of exercise, and when I’m pushing too hard. I have nothing but good words to say about this company and especially their ‘cardiac coaches’ and their technical support team.

At 742$ (CDN), the X2 device is a poor choice HRM for sports. It is not compatible with Ant+ devices (at that price point its incomprehensible when most cheaper alternatives support both Ant+ and Bluetooth). And even with BLE, there are plenty of communication issues. The FF website says it's compatible with Zwift, but it is not the case, support replayed its a known issue and they working actively to resolve it with Zwift. Why is there an issue in the first place, when you use open standard communication protocols and claim to be compatible trird party software ? A sub 100$ Ant+ and Bluetooth compatible HR monitor will perform better for a fraction of the cost. If you are looking for an ECG device, there are also 139$ options out there.

Customer service at Frontier has been top-notch. They are quick to respond, professional, knowledgeable and looking to resolve any issues. I am also very happy with the Frontier X2 HRM. It connects seamlessly to my Garmin 955.

I had a problem with the Fourth Frontier not functioning consistently. The team at Fourth Frontier were responsive, engaged and resolved my device's problem with a quick replacement. Appreciated!

Rubbish product. Avoid. Sometimes turns on, sometimes doesn't. Takes numerous attempts to reset it. Sometimes connects to the app, sometimes doesn't. For the cost of it I'd expect far better. Save your money and get a cheap chest heart rate monitor from amazon

I purchased an X1 in November 2021 after a heart scare. At 1st i was impressed but within a few weeks the issues crept in and then the device broke within a year even with light indoor-only use. A replacement X2 was sent out as it was still within warranty however 13 months after getting the replacement (by which point i was using the strap very infrequently due to numerous issues) the same issue happened with the X2 where it pretty much fell apart within the monitor. Customer service have taken 5 months to tell me there is nothing they will do as it's out of warranty now so I'm left with a useless bit of kit which I'm unable to repair or recycle and it's been a complete waste of money. The app works poorly, the device doesn't appear to have a way to switch off so i ended up having to charge it before each use, the data refresh was unacceptable when i 1st got it but has improved with software updates since. Beware the claims of intelligent analysis of your workouts, the feedback is very very basic and gives no real insight in to your fitness or training. Edit: since writing the review here the company reviewed my issue and provided a replacement.