I have a golf GPS that requires me to download the course information before I can play for the first time. That process isn't simple or without problems. This Garmin S1 is the easiest thing to use. You turn it on, tell it you want to play a round of golf (since it comes up in watch mode) and it displays a list of the courses nearby. So if you are at a golf course when you tell it you want to play, you don't have to go searching for the course you want to play, it is already on the top of the list you select from. If there is more than one course nearby, as there is at my golf club, the different courses will be listed for you to choose from with the closest first.
Using the S1 during play couldn't be easier either. You don't have to change holes manually, it knows where you are and therefore what hole you are on. You can change the holes manually, but it isn't necessary under most circumstances.
I'm used to wearing a watch during play, so I didn't have much to get used to in that regard. If you don't normally wear a watch, this may be a problem. The watch and band are one solid piece of plastic. I guess that's good for the integrity of the device but don't think you will change bands to a slip-on-type to avoid having to mess with this strappy-type.
The device acquires the satellites quickly, adjusts to movement quickly and seems to be quite accurate. Certainly accurate enough for my play.
The difficulties others have mentioned about attaching the clip-on charging device are real. You've got to mess with it a little to get a good connection. The directions tell you what the screen should look like if you get a good connection, so it's isn't that big of a problem if you know what you are doing. It's an issue, but not enough of a problem to take away a star.
I know this S1 GPS doesn't have all of the features of Garmin's S3 version or other GPSs on the market, but I don't need them. My other GPS has those features and they just aren't that useful or in some cases, that easy to use. In fact, the simplicity of just getting the distance to the green is a real advantage to me. And for the price difference between the S1 and the S3, I don't think you can do better than this device.
For the simplicity, ease-of-use during play, low price and fast, accurate readings, I highly recommend the Garmin Approach S1 Golf GPS.