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{{DISPLAYTITLE:Epson Runsense SF-510 Review}}
If you're looking for a watch for ultramarathons lasting for 20 to 30 hours, the Epson SF-510 is worth serious consideration. For everyone else it's best avoided as there's little to like about the SF-510. The Epson range feels like it's 5-10 years behind other companies which with the rapid advances we've seen in ergonomics and functionality is an age. The Epson looks rather clunky, with cheap feeling materials and a design that does not seem to have had a lot of effort. If the SF-510 were ultra-budget, it might be more viable, but they'd need to drop the price down much further to be value for money. My overall score for (Update: the SF-510 is prices have dropped a cheerless 1/30long way now, so it's looking a little better. ) Looking at the four basic questions I use to evaluate the foundational capabilities of a running watch, you can see the weaknesses.
* '''How far did I run?''' This is the most basic question, and Epson make a big deal about their "highly accurate GPS tracking." Epson created their own chipset to ensure accuracy, but my testing indicates that the SF-510 is one of the least accurate devices I've tested, even worse than the [[Epson SF-810]]. This is a major disappointment given how far behind the state-of-the-art Epson are in other areas. However, if you compare the accuracy of the SF-510 with other watches in extended battery mode, where they wake up and check the GPS signal periodically, then the SF-510 does much better.
* '''How fast am I running?''' Knowing how fast you're running can be a nice to know, or it can be vital for your training or race performance. Because GPS never really provides the level of accuracy you need for good pace information, the best watches support the display of current [[Pace From A Footpod]] while getting all other data from GPS. Sadly, the Epson does not have this feature, and doesn't even support the use of a Footpod at all.