Originally posted by Steve:

Hard to sneak in Burial chambers as I think they can hear you open doors. Not sure on that but it seems to be my experience. Combat will also alert nearby mobs as well.

It also seemed a bit glitchy, but whether it was sneak or the burial chamber, I don't know. Once the eye went wide open when there was nothing around, so something must have been alerted through several walls. It just seemed off.

Originally posted by Steve:

I think, IIRC, sneak skill also reduces the stam you use while sneaking, or the speed you move at. Maybe both.

yeah, I think I am a little faster now, at Sneak 27. Stam is hard to judge because I have more of it now.

Originally posted by Steve:

I don't use sneak an awful lot anymore, but did with my first playthrough as a dagger user. ATM my sneak is maybe 10-15 tops in Mistlands. If I do sneak to backstab a mob I can usually manage it outside as long as I'm behind them and watch the eye meter and noise I make.

I'm not convinced I could, even at my higher level. When I was very low level, it didn't seem to matter how I approached deer, it just worked (OTOH, it never worked with boars; far easier to just run up to them and stab them), but it doesn't now.
Maybe I killed off all the deer with poor eye sight and there's only the others left now...
Can't sneak up on greydwarves or greylings at all. It's not always they see me, but they seem to hear me no matter what I do.

I'm pretty certain 1 star skeletons spot me faster than the normal ones, which is kind of a nice mechanic.