I bought this GPS because I thought my SonoCaddie GPS was lost. I ended up finding it (after I purchased the G5), and to make a long story short, my boy has the (old)SonoCaddie and I have the G5 :) Right off the bat I knew this was a well built unit, just from the heft/feel of it. The first time I used it was in the first tournament I ever played in that wasn't a captain's choice. Although there isn't any way to "edit" distances, I found the pre-loaded courses to be very accurate. The ability to calculate your second shot on Par 5's is awesome and zooming in on the green and being able to adjust the flag is great as well. Another cool thing is being able to look up courses and preview each hole as well as finding local courses while on travel. I'm not sure how long the batteries last (I'm using rechargeable) because I played about 4 rounds with it and haven't played again, but I still have a charge. It probably would be nice if it had a battery indicator to let you know how close it is to dying, but I just have a spare set of akaline batteries on hand just in case. So to sum it all up, if your looking for a great golf GPS and you need something on your Xmas list (so you don't get another tie) this is the unit for you.