Decent. Traffic very very useful. Good when it works!

1/19/17: Finally, live traffic issues now fixed. Need to manually launch and/or force close and re-open app if it doesnt connect automatically or you walk away from car and return while gps is on. Also sometimes helps to launch the app and click on live traffic to pull in the data. Seems to be quicker than letting it do it on its own in the background. Not perfect but now much better with bug fixes. Thanks Garmin!

1/16/17: Updated to latest version and its still garbage. Minor update but love traffic still not working on Drive Smart series. Waits for traffic data and only works sporadically. Quality control is taking a nose dive! Atrocious Garmin

1/7/17: THEY BROKE LIVE TRAFFIC WOTH LATEST UPDATE. They made live traffic a free service now but its worse than ever. Doesnt pull on traffic or display traffic on DriveSmart series hardly at all now. No wonder its free. Should have left it. Its even worse than it was. Dont they test these updates properly? What a mess Garmin.

UPDATE 7/29/16: Working better with the DriveSmart series. Occasionally you have to disable Bluetooth in the gps and then re-enable if you have issues.

UPDATE 1/22/16: This app is good when it works but usually after several times of use, it fails to automatically reconnect to the GPS and you have to turn Bluetooth services off on your nüvi and then turn them back on which is extremely frustrating. Occasionally, you even have to repair it with the phone and this is happened on multiple iPhones Ive used. Also, the map quality on the app itself is atrocious. It only shows major routes and you have to zoom way into even see anything. They need to update the resolution map quality to be more in line with Google maps or Apple Maps.

UPDATE 9/16/15: A mess after iOS 9! Garmin has not updated the app and now its horrible. Blank white tabs that are unreadable. Also crashing on voice entry when searching. Please fix asap!! Garmin says a fix is in works but may be too little too late.

Needs work but traffic is the most valuable feature and provides better coverage than the FM traffic receiver on the unit

Iphonerocks00 about Garmin Smartphone Link, v2.3.2