To edit coordinates...make a way point....then edit the waypoint...its a little odd but it works.
I have been buying Garmin since the mid to late 90s...all have been good reliable units. Garmin seems to be on top of things when bugs occur, Many may disagree with me. I have heard therewere troubles with the Colorado but it looks like Garmin is trying to fix them.
I just purchased a Oregon 400t and this is the easiest unit I have ever owned. I think most of the gripes come from people expecting a military grade unit in a consumer package.
I love the paperless GC feature and the touch screen speeds things along. Is it perfect of course not but I am happy so far.