Fantastic watch...solar+atomic+perpetual calendar mean set it and forget it. I use the world time (I travel frequently) and countdown timer constantly. Temp works well if not on the wrist (I use the wrist strap to attach the watch to my backpack for 20 minutes before using, which generates a reasonable reading). Altimeter is fairly accurate-I have not used the barometer much. About the only feature I would like to see is a setting which would allow the afterlgo to stay on slightly longer-it's adequate for telling time at a glance but doesn't really allow you to adjust settings etc in low light conditions. G-Shock should insure super reliability, but I haven't had the watch long enough to comment.