Jeff Stewartwrote a review of Garmin Edge 510 Bike Computer on January 28, 2015
Familiarity: I've used it several times
I've taken the liberty of reading a host of the complaints above, and honestly, I haven't experienced many of them myself. Granted, I've only been using this CPU for about a month, and I'm also not pairing it with a powermeter, but I haven't had any connectivity issues when pairing it with an iPhone 5C. The closest that I came was after a software update on both devices at the same time, but they simply had to find each other again and that was that.
In terms of connecting to Garmin Connect, the pairing has been relatively seamless. Getting my rides to Strava, however, took some creative, outside the box thinking to pull off. But now, I just went with the set it and forget it approach and have the two accounts synced to upload every ride to the Stravas. Getting courses onto the 510 is a bit of a jigsaw, though, but again, some creative thinking managed to get around this. I'm setup to create on the laptop, which syncs to the Garmin Connect app, which then syncs with the 510. Riding the courses in real time does not always work, though, and when it does, the amount of notice you get before a turn on the road can be very abrupt or even late. On the trail, it's completely absurd. Every bend or switchback is prompting a direction, and the experience really borders on intolerable. And on a side note, I have had some jamming on the various GPS and Acquiring screens upon startup – a little annoying, but not terrible.
Now, you're probably assuming that I hate this damn thing, but in actuality, I really do like it — especially after breaking my no computer ride policy that lasted nearly a decade. The battery life is pretty good, and I haven't had it take a dump on me during a ride yet. For my commutes, I've been running the backlight at about 50%, and after 10 miles each way, I arrive home with about 3% dissipation in the battery life. Not bad. During daytime rides, with normal backlight settings, the battery is totally fine.
The onboard metrics work well, and the customization of screens is a nice feature. The size is also really good, for both the unit as a whole and the screen. Post-ride analysis features are also pretty good on Connect, but the community isn't engaged enough to make it as interesting as Strava. An example is the variance in segments. My daily commute has no segments on connect and about 14 on Strava. Oh well, I'm not reviewing Connect. The touchscreen is also pretty intuitive, and works pretty well with gloves — even non-EIT iterations.
When it all comes down to it, the computer works really well. The GPS features are pretty dialed for the price. Onboard metrics are cool. And all of the weird stuff from the commercials, like Vaughters tracking your every move, is just stuff that hardly anyone uses, let alone actually needs. I haven't gotten it wet yet, so maybe my opinion will change whenever it decides to rain. For now, however, I give it a solid four stars with room to improve.