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Within each model, there are choices of wristband type, with a metal wristband adding $150 and sapphire glass adding $100. There are also a number of color choices, though the 5X is only available in gray. So, which to buy? I'd recommend getting the 935 as it's cheapest. The only reasons to buy the Fenix version are if you need maps (5X), you want the Fenix look, or you want the smaller size of the 5S. Of course, with the release of the Fenix 5, you can get the [[Garmin Fenix 3 ]] at a lower cost. The Garmin Epix is also worth considering as it has the maps of the 5X, but Garmin has stopped releasing firmware updates and it's nowhere near as attractive.
=The Big Questions=
For a [[Best Running Watch| simple evaluation of a GPS watch]], I look at how well it can answer some basic questions. There are many things a runner might look for in a running watch, but I feel these four questions are critical.
|[[File:Fenix 5X Connector.jpg|none|thumb|300px|]]
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Note that the Fenix 5X can be charged while recording, but the location of the charging port makes it difficult to [[Charge On The Run]].
=Configuration=
Most of the configuration of the Fenix 5X is done directly in the watch, but there are aspects that have to be done via either the website, the smart phone app, or the PC (Garmin Express.) The main thing that you can't do on the watch itself is configure Connect IQ apps, watch faces, and data fields. The configuration on the watch is fairly intuitive, but the sheer number of configuration options can be a little bewildering, and if you have to do a factory reset, you have to apply all configuration changes again from scratch. While that's a bit of a pain, it's rarely a problem in practice, and more than made up for bite the ability to configure the data shown during a workout without needing an Internet connection. Even better, you can configure the data shown during the workout actually during the workout itself. I find that surprisingly useful; just today it turned a little warm, and I was able to reconfigure my display to show the current temperature. It's not obvious (or it wasn't obvious to me) but you can copy a sports mode so that you can have multiple configurations for different types of work out. That way you can have a run based work out for easy runs, long runs, into full training, etc. this is rather nice, especially with the [[Stryd]] Footpod providing accurate pace information, which makes the pace alerts especially valuable. There is a limit that only allows two Connect IQ data fields, so having multiple workout types are allows you to have different combinations for different types of training.
As with all the watches I test, I first left the Fenix 5X in its "ready to go" mode with a clear view of the sky for over 30 minutes. This is to ensure that the chipset has ample time to download the almanac from the satellites, which should only take about 12 minutes. I also give the Fenix 5X at least five minutes after it has got a satellite lock before starting my run. This is to give it the best possible chance of having good accuracy. (Like most modern GPS watches, the Fenix 5X will download information on the satellite orbits when it's synced, but this predicted information is not as good as the live for data transmitted by the satellites themselves.)
[[File:Fenix 5X Soaking.jpg|center|thumb|300px|Soaking the Fenix 5X.]]
Remember that to the overall firmware version number doesn't influence GPS accuracy. You have to look at the GPS firmware number.
[[File:Fenix 5X Firmware.jpg|center|thumb|300px|Here's where the version number of the GPS firmware is located.]]
==Smart or One Second Recording?==
The tests are with GLONAS off as I've consistently found in prior testing that GLONAS reduces accuracy. I also use smart recording rather than 1-second as this only changes recording frequency, not the frequency of GPS polling. Below is a comparison of 1-second and smart recording to demonstrate this.
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=Optical Heart Rate Monitoring=
I've not found any Optical Heart Rate Monitoring (OHRM) implementation that's good enough to be useful, and the Fenix 5X is no exception. I believe that you're better off having no heart rate data than bad heart rate data. While a chest strap based heart rate monitor can have accuracy issues, these are generally dramatic and obvious, whereas OHRM can be quite misleading. (The issues with a chest strap heart rate monitor are also usually fairly easy to remediate, either with some electrode gel or a new battery.) The accuracy of [[Optical Heart Rate Monitoring]] (OHRM) will depend on a number of factors: