| Price | $329 | $229 | $169 | $253/€220 |
| Product Announcement Date | Jan 7, 2013 | July 1st, 2015 | June 4th, 2015 | January 26, 2014 |
| Actual Availability/Shipping Date | Jan 2013 | July 31st, 2015 | July 2015 | March 2015 |
| GPS Recording Functionality | Yes | Yes | Yes | Yes |
| Data Transfer | USB & Bluetooth | USB & Bluetooth Smart | USB/Bluetooth Smart | USB |
| Waterproofing | IPX7 | IPX7 | IPX7 | IPX7 |
| Battery Life (GPS) | 20 hours | 15 hours | 12-17 Hours | 10 Hours |
| Recording Interval | 1-Second or Smart | 1-Second or Smart | 1-second | 1-second |
| Alerts | Audio/Visual | Audio/Visual | Audio/Visual | Sound/Visual |
| Backlight Greatness | Great | Great | Great | Great |
| Ability to download custom apps to unit/device | No | Yes | No | No |
| Acts as daily activity monitor (steps, etc...) | No | No | No | No |
Music | Garmin Edge 510 | Garmin Edge 520 | Polar M450 | Polar V650 | | Can control phone music | | No | No | |
| Has music storage and playback | | No | No | |
Connectivity | Garmin Edge 510 | Garmin Edge 520 | Polar M450 | Polar V650 | | Bluetooth Smart to Phone Uploading | No | Yes | Yes | Not yet |
| Phone Notifications to unit (i.e. texts/calls/etc...) | No | Yes | No | TBA |
| Live Tracking (streaming location to website) | Yes | Yes | No | No |
| Group tracking | | No | | |
| Emergency/SOS Message Notification (from watch to contacts) | No | Yes | No | No |
| Built-in cellular chip (no phone required) | No | No | No | No |
Cycling | Garmin Edge 510 | Garmin Edge 520 | Polar M450 | Polar V650 | | Designed for cycling | Yes | Yes | Yes | Yes |
| Power Meter Capable | Yes | Yes | Yes | Yes |
| Power Meter Configuration/Calibration Options | Yes | Yes | Yes | Yes |
| Power Meter TSS/NP/IF | Yes | Yes | No | Yes |
| Speed/Cadence Sensor Capable | Yes | Yes | Yes | Yes |
| Strava segments live on device | Q3 2015 | Yes | No | No |
| Crash detection | | Yes | | |
Running | Garmin Edge 510 | Garmin Edge 520 | Polar M450 | Polar V650 | | Designed for running | No | N/A | No | No |
| VO2Max Estimation | N/A | (CYCLING YES THOUGH) | (For Cycling, yes) | N/A |
| Recovery Advisor | N/A | (CYCLING YES THOUGH) | (For Cycling, yes) | N/A |
Swimming | Garmin Edge 510 | Garmin Edge 520 | Polar M450 | Polar V650 | | Designed for swimming | No | N/A | No | No |
Triathlon | Garmin Edge 510 | Garmin Edge 520 | Polar M450 | Polar V650 | | Designed for triathlon | No | N/A | No | No |
Workouts | Garmin Edge 510 | Garmin Edge 520 | Polar M450 | Polar V650 | | Create/Follow custom workouts | Yes | Yes | Yes | Yes |
| On-unit interval Feature | Yes | Yes | Yes | No |
| Training Calendar Functionality | Yes | Yes | Sorta | No |
Functions | Garmin Edge 510 | Garmin Edge 520 | Polar M450 | Polar V650 | | Auto Start/Stop | Yes | Yes | | Yes |
| Virtual Partner Feature | Yes | Yes | Sorta | No |
| Virtual Racer Feature | Yes | Yes | No | No |
| Records PR's - Personal Records (diff than history) | Yes | Yes | Yes | No |
| Tidal Tables (Tide Information) | No | N/A | No | No |
| Weather Display (live data) | Yes | Yes | No | No |
Navigate | Garmin Edge 510 | Garmin Edge 520 | Polar M450 | Polar V650 | | Follow GPS Track (Courses/Waypoints) | Yes | Yes | No | Planned |
| Markers/Waypoint Direction | Yes | Yes | No | No |
| Routable/Visual Maps (like car GPS) | No | Yes for maps (but not routable) | No | Yes |
| Back to start | Yes | Yes | Yes | Yes |
| Impromptu Round Trip Route Creation | No | No | No | No |
| Download courses/routes from phone to unit | Yes | Yes | Yes | Planned |
Sensors | Garmin Edge 510 | Garmin Edge 520 | Polar M450 | Polar V650 | | Altimeter Type | Barometric | Barometric | Barometric | Barometric |
| Compass Type | GPS | GPS | | GPS |
| Optical Heart Rate Sensor internally | No | N/A | No | N/A |
| Heart Rate Strap Compatible | Yes | Yes | Yes | Yes |
| ANT+ Heart Rate Strap Capable | Yes | Yes | No | No |
| ANT+ Speed/Cadence Capable | Yes | YEs | No | No |
| ANT+ Footpod Capable | No | No | No | No |
| ANT+ Power Meter Capable | Yes | Yes | No | No |
| ANT+ Lighting Control | Q3 2015 | Yes | No | No |
| ANT+ Bike Radar Integration | Q3 2015 | Yes | No | No |
| ANT+ Trainer Control (FE-C) | No | Yes | No | No |
| ANT+ Remote Control | Yes | Yes | No | No |
| ANT+ eBike Compatibility | No | No | No | No |
| ANT+ Gear Shifting (i.e. SRAM ETAP) | | Yes | No | |
| Shimano Di2 Shifting | Yes | Yes | No | No |
| Bluetooth Smart HR Strap Capable | No | No | Yes | Yes |
| Bluetooth Smart Speed/Cadence Capable | No | No | Yes | Yes |
| Bluetooth Smart Footpod Capable | No | No | No | No |
| Bluetooth Smart Power Meter Capable | No | No | Yes | Yes |
| Temp Recording (internal sensor) | Yes | Yes | No | Yes |
| Temp Recording (external sensor) | No | No | No | No |
Software | Garmin Edge 510 | Garmin Edge 520 | Polar M450 | Polar V650 | | PC Application | Garmin Express | Garmin Express | PC/Mac | Polar Flowsync |
| Web Application | Garmin Connect | Garmin Connect | Polar Flow | Polar Flow |
| Phone App | Garmin Connect (iOS/Android) | iOS/Android/Windows Phone | iOS/Android | - |
| Ability to Export Settings | No | No | No | No |
Purchase | Garmin Edge 510 | Garmin Edge 520 | Polar M450 | Polar V650 | | Amazon | Link | Link | Link | Link |
DCRainmaker | Garmin Edge 510 | Garmin Edge 520 | Polar M450 | Polar V650 | | Review Link | Link | Link | Link | Link |