I've had an S6 for a few years. I've also tried other watches over the years like the Avocet Vertech, Suunto Observer, Nike ACG Ascent, and other older-generation Suuntos. My favorite of the bunch is the Suunto Observer for all-around mountain use (climbing, skiing, etc.)
I just use it for logging my vertical footage (and to know what time it is, of course). It works very well for that.
I tried messing around with the clinometer once and gave up in frustration. I expect if you're someone who really needs that feature, you should be able to make a go of it. Expect to spend some serious time with the watch in one hand and the user manual in the other.
Another thing, this watch eats batteries like my wife eats bonbons. Luckily they are user-replaceable and not too expensive. Finding them in ski-town stores is often possible, but not always. Not a bad idea to get an extra battery or two and bring one along on fly-away trips.
One other gripe: if you're interested in using the 'Suunto Ski Manager' software to store data, etc. on your computer, it is Windows-only. No Mac option last time I checked. For most people, this is not an issue. But it was for me.