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From Fellrnr.com, Running tips
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* The SF-810 can upload your workouts via a Bluetooth link to your smart phone, but yet again this proves rather impractical. The Bluetooth link takes so long to upload your workouts that this is unworkable for regular use. The upload via a PC is less painful, but still feels rather crude and unfinished.
* Epson will upload your workouts to their website, which is rather rudimentary. There are various options for syncing your data with other sites, but if you want to have your lap splits included then things get tricky. I had to sync my Epson data with Strava, download CSV data from Epson, download TCX data from a Strava, and then write code to combine the two. You can consider me thoroughly unimpressed.
=GPS Accuracy =
The SF-810 did surprisingly badly, especially given Epson's claim of "outstanding accuracy". The statistical analysis at [[GPS Accuracy]] gives quantitative details on the problems the SF-810 has, but for some folks a qualitative picture is more useful. The image below is from a small section of the trail I use for testing as I've found it highlights the strengths and weakness of the different devices nicely. The most obvious problem is how widely scattered the lap markers are, with some of the markers near the bridge actually ending up on the wrong side. The section in the middle with the rounded curves shows how badly the SF-810 does, with few good (green) tracks and mostly bad tracks. This reflects what I saw on the watch itself when gathering the data, as it struggled badly in this section. The section under the bridge is better, and counterintuitively this is a section where most watches do well. You can see the SF-810 gets a little confused a few times, but overall it deals with the interruption well. The right angle turn on the right of the image is poor, but not as bad as the curved section.
{| class="wikitable"
|- valign="top"
[[File:BridgeEpson SF-810.jpg|none|thumb|x300px| A diagram of the Epson SF-810's tracks, color coded with green indicating good accuracy through to red indicating poor accuracy, and the lap markers as blue dots.]]
|- valign="top"
|[[File:BridgeSuunto Ambit2 R 2.0.11.jpg|none|thumb|x300px|For comparison, here's the tracks from the [[Suunto Ambit2]], which does remarkably well. This is how the data should look. ]]
|}
(I've contacted Epson support and they are aware of the problem.)
=What's Missing=
While I don't consider these missing features as 'cons', it's worth understanding the features that are missing compared with other watches. You'll notice that the SF-810 has a rather long list of missing features.
