So far, so good. My device has worked well and the couple times I have encountered an issue, Fourth Frontier customer service has been extremely responsive. The device has integrated well with my Garmin and I have been using it on every ride. Although I purchased it after having an episode of suspected afib on a ride, I have not had anything similar since, so I have not had the occasion to share my ECG data with my doctor. However, I will take that!

My device stopped working and they exchanged it for a new one instantly. Fourth Frontier 2 has given me the confidence to get back to peak training. After an unfortunate heart event in 2022, I started using this device and I will be doing Ironman Copenhagen in 2025 with my Frontier 2.

I've had the X2 for nearly 9 months and it's been a really effective addition to my training regime. That said they say the best test of any company is when something goes wrong. Sadly my device has developed a fault and for the last month I've been batted around various customer service departments with promises of fixes and resolution of my problem. I'm now into my fifth week of not being able to use my device and once again another generic reply to my email stating it's been passed up and expect a reply in the next 24-48 hours Seriously. This device cost a fortune. Stand by your product and deal with problems in a timely way that resolves the issue for the customer Classic generic reply from Fourth Frontier on here. I'm already in direct contact and getting nowhere hence the negative review. Happy to take a small fortune for the device - less keen to replace one that hasn't worked for five weeks

I have had the X2 for a few weeks and I love it, both as a physician and as an athlete! The set-up is quite straightforward and I was able to see a streaming EKG within minutes. I like the many automated features such as % of time with normal v. 'other' heart rhythm, especially during longer collection periods. Use during extreme physical activity is also very good- a few occasional 'noisy' periods but overall very good. Additionally, not requiring your phone (or any device) to be close by is also an important feature. Once you have your phone available, it will simply synch at that time. Downloading the complete EKG to my laptop as a PDF file is a critical and very useful feature, especially when I want to share the tracings with others. I also found the technical support to be excellent: Jayadev was affable, available and very capable. Kudos to Frontier for a great product!

Vijay did a great job explaining the device and answering my questions prior to purchase.

It helps me to know real time understanding of my internal dynamics

The customer service prior to buying the device was awesome. They answered all of my questions and set up a phone call with me. After I purchased the device, they offered me another call to go over things in more detail. The device itself has a very nice form factor is completely comfortable. I wore it for a four hour endurance race. I even got some mud underneath the electrodes, but was able to wipe it off with my finger and continue to get solid readings for another two hours. The amount of data that you get is very valuable. It’s also excellent feature to be able to feel a vibration on your chest when you are pushing your heart past where you want to be The live ECG function works very well. It is limited to one hour but for most applications I think that is completely reasonable. I streamed the first hour of my race to my friends and my wife just to see how the data came through. I charge the device once and I use it six or seven hours of training , the sinking is very fast happens automatically and wirelessly. I would like to see some more activity types or to be able to put in my own activity type that I can save in the app well worth the price highly recommended I am going to try to get all of the athletes on my team on this tech .

Really great idea and design and simple to use but just not quite there... Connectivity drop outs are constantly a problem with devices or will not sync with other third party apps. Heart rate while running is wildly and regularly off target compared to polar (easy zone 2 runs regularly register 180 BPM periods then drops to 0 and I can't tighten the strap anymore as advised!). Sadly end up returning to using polar straps which is a shame as the extra heart Information is a big selling point. Hopefully they will improve.

Fantastic device. I’m a physician and aging competitive athlete. I’ve used many devices to track and monitor health and performance over many many years. Some good, many junk. The Frontier X2 itself, the presale education, post sale technical and health reviews and education are perfect and outstanding. Looking forward to even better insight and tracking my health and performance over the coming years with the Frontier X2.

I'm happy with my Frontier X2. My training is safer and I can improve my performance in a healthy way. I can also take benefit from the biomechanical parameters like Cadence and Body Shock. There are a lot of useful information in the App and the Webpage. The support is excellent!