The user interface isn't easy to use, but I had the touch screen 820 and returned it since the screen is hard to touch when riding.I love that this comes with cadence, and speed, and heart rate monitor (chest strap kind).The screen is designed to more or less face the sky. Don't angle it up, that washes out the display. With the screen pretty much parallel to the ground, it is very easy to read.For the longest time, I didn't know what the play button was, it's on the bottom of the unit on the right. The bottom button on the left is a return back to the previous screen button. This button bottom left also functions as a lap recorder when you are ridingThere are three buttons on the left, the top one to turn the unit on (and adjust brightness), up and down buttons to scroll through lists.When riding, the up and down buttons take you from ride info, to map, to directional guidance. You can use the Garmin Connect app to set what appears on the ride info screen. You can also do that in the unit, but it is easier in the app.Top right there is the select button, and I can't remember what the lower button on the right-hand side is. Total of 7 buttons, a bit confusing, not intuitive at all.I took it on a 1 hour 20 mile right, and it used about 5% of the battery, so I expect that it would last for a couple of centuries before needing to be charged. Oh and it connects with your Strava account, you don't need to do anything other than setting it up once in the Garmin app. And Strava interacts with an app called Relive, which is really cool, I highly recommend that you get Relive too.