I own a yellow "classic" vector & have done for quite a few years now.
Firstly, if you only use this for winter / sport pursuits (ie seasonally) & you lose the manual it's available on suunto's own site. (guess what, me too)
As I have a head injury (sports related) I can't always remember the not overly simple settings & record keeping this watch offers, so I've printed out the relevant pages & read em again before I go on a trip ...seems to work!
That said it is fairly uncomplicated to get to grips with especially if you wear this day to day.
In seasonal use mode I find a battery can last 2-3 years depending on how much you use it based on numerous weeks away, the battery is easy to replace (no special widgets needed, (just watch for the waterproof gasket seal & replace it from time to time, depending upon your sport & proximity to water (or shock pressure).
frequently realign your compass (simple, & as part of any ongoing kit checks) ...a few mere seconds before you really need it.
Altimeter, gaining & dropping height may put it out (& therefore affect the barometer readings) ..this is usual for all of this type of kit, so try to find periodic points where you can check (within 5 metres) to ensure it's up to date & handling your movement, (we don't all carry maps) but things such as base stations & O.S. markers are a pretty good bet.
Thermometer, ..if it's on your wrist the reading will be out (body temp) so do stick it on a ski-pole or "whatever" & leave it for at least 15 mins to 30 mins as a guideline (eg whilst having lunch) ..I often stick mine on my jacket d ring if i'm monitoring temps closely.
A great bit of kit for timing your ski-ing / snowboarding runs as to metres per second / minute etc to see if you've improved, so good for race training or just beating your personal best if out on your own, something to set yourself against on a known run!?
The Bezel is a bit tight (it should be) & the strap is on the small side (imho), that could be comfier, however this is the low end of the market & not to quibble it is comfy over extended periods.
It can change between functions due to the top layer catching (elasticated cuffs), but hardly a trauma, & often i've been thankful for that when it's prevented snow going up my arm in a bale!
I have found falling on this not a problem, doesn't seem to have ever hurt my wrist from landing badly whilst jumping around (( snow bales)).
The light up (night) mode is frugal, lasts around 4 seconds enough time realistically to see what you need, battery conservation being a priority.
(battery status indicator too)!
A great watch & veritable classic, I'm happy to own it, it takes knocks & performs well.