I've got the SX11s in 170 and they fly! They are extremely stable skis and I often just let them run straight down runs without any problems (except on ice though where they can track along grooves if they are not on edge). If the snow's OK, just point and hang on - you'll be fine. I haven't found them particularly unforgiving either but you can always tell that they want some aggression and speed to perform properly. Some people get into trouble on these because the skis prefer to carve accelerating medium to long turns, rather than tamer short turns, and so you can find yourself going quicker than normal in a very short time. That's the fun bit
When you get them tuned, I suggest you keep them at the factory settings of 1 base and 3 side. One shop last year tuned my edges with a 2 edge and I could notice the difference on the ice (where previously they were excellent).
It's great to see the forum back up. I'm getting ready for the Australian opener (if there's any snow) and then New Zealand in July/August.