There are a few versions available I myself own the PAG40:
I picked this up when I wen to the police academy 3 years ago because I thought it was what I was suppose to do. While I have beat it up and t has served me well i do not and have used any of the features on it as I thought I would have. The temp sensor on this thing takes about 15 minutes to adjust to extreme temperature changes. Having it on your wrist effects that as well.
The compass while good enough has never been needed on my end. i haven't gone anywhere that merited a compass anyway.
Stop watch and alarms, any $20 watch has those so it's not even worth mentioning as a feature.
This one has a barometer, that's nice.
My watch has an altimeter in it, it's accurate. But when I'm out shooting rifle at 800+ yards i have my Kestral that gives me all the info I need so again, a feature I don't use.
The watch in and of itself is a good rugged piece. It has a lot of nice features on it should you find yourself in a SHTF sitaution but from a practical standpoint in the real world you wont get much use out of it's many features. Your better off with a watch that has a nice big face and dials you can read. A bezel with military time is a plus and maybe the date on it.
If you need to know the temperature I'll give you some advice, if your sweating it's hot, if your shivering it's cold!
Clean and big dials, trust me on that. Here's what I wear on duty:
and btw, as far as gaskets go, $8 on ebay straight to your door