This watch is amazing really. It is always spot on to the second accurate - due to atomic time sync. That in itself is reason enough to buy it.
It is self sufficient in that it is solar powered so no worries about batteries running out. Big plus.
I personally like the barometer graphing function which can be set to be on permanent display. The shape of the graph gives a good indication of improving or deteriorating weather - this is one of my favourite features of the watch. It's a mini weather station.
I'm not so bothered about the altimeter, or thermometer. I guess if you were camping and took the watch off it might be interesting to take the temperature.
The compass is really a good feature, if you got stuck out in fog walking it might be a real help to get you back to a road or whatever. You won't use it as main navigation device for serious orienteering but it is neat. Also if you got lost in a city, it would at least re-orient you.
The hands are not luminous, which is probably the only minus for me, I am used to luminous hands.
But a neat feature is that it will turn on the light if you tilt it to your face. This only happens if it detects it is dark, so again a handy feature when driving at night etc. Cleverly it detects that it is facing you, and not hanging down by your side before it switches on the light.
It has all the other functions such as stopwatch, countdown, world time.
It is surprisingly light and comfy to wear.
I personally chose this watch because of the analogue hands, this gives it a certain amount of gravitas which pure lcd could never have.
Another neat thing is that it has self aligning hands so they always point spot on correct, eg the second hand is always pointing to the tick marks round the edge.
I think it is a lot of watch for not much money. Hey compare it to the price of a Rolex, it's less than a bezel insert for one of those.