Bests & Worsts Reviews from Amazon

As an owner of the 500, I upgraded because I live in San Francisco and do urban rides in which its hard to maintain GPS coverage, the GLONASS was a strong selling point to me. Pros: -GLONASS works as advertised, pick up GPS FAST, even in the middle of downtown SF. -UI is sleek, innovative and easy to use -Measures everything I want it to -SO much potential here for this unit IF and WHEN they release the firmware to make it work CONS: -There is currently a known issue in which all ANT+ sensors randomly drop out and both show and record bad data making this useless. -Elevation data is incorrect, I am hoping this is a firmware fix, but worried its actually hardware. THis unit shows 2-3X the elevation gain/loss that my 500 or iPhone apps do on the same rides. This is also a known and common issues according to the forum boards and Strava CS. -Battery life is not great, not anywhere near what the 500 was, maybe 50% of it -Screen is not as easy to read as the 500, often leaving you wanting the backlight, but this unit will only last about 6 hours with backlight running -Notification system is ridiculous, every time there is a notification the whole screen dims and you must physically touch the unit to dismiss it. IF you are in the middle of a workout this can really cripple your ability to execute and enjoy your workout. -Garmin continues to see Strava/Training Peaks and other 3rd party sites as their competition rather than the reasons we buy their unit in the first place. As such they block these other apps from either being able to connect to the unit to gather data, or utilize the bluetooth connectivity to automatically post your ride to their sites. Garmin only lets you upload via the bluetooth directly to garmin connect which is years behind Strava in terms of development and features. -Weather updates do not work as advertised, but they are incredibly annoying. For example, I was out riding and every single minute it would push me a "flood warning" that would block my access to the data and screens until I dismissed it. -Following courses is slow and buggy, much like the 500 that never had its feature fixed. All in all, this unit has a lot of potential if and when it gets the updates it needs to work properly. Unfortunately, Garmin is unresponsive to its users and slow to release firmware updates for known bugs despite the thousands of angry posts on their forum boards. They may regret this someday when a viable competitor releases a product that can rival theirs. Instead of innovating, working with partners such a Strava, testing their products prior to release, and acting on known issues, they have began to act like a monopolistic company would. If you train with a power meter, or rely on your other sensors such as speed/heart rate, your best bet is to watch their forum boards and hold off buying until Garmin posts a fix to all the issues this unit is currently having. A fix was recently posted for the 810 that helped some, but not all of the similar issues the 810 was having, but the 510 has been left out in the dark. If history is any indication they will get this right, but they will be slow and not address all the issues. Past users of the 500 can attest to this, along with early adopters of most any of their units. I'll happily adjust my rating once Garmin gets these issues fixed. THis has the potential to be a 5 star unit, but the fact they released it in its current state says a lot about Garmin as a whole.