Chris, I've not found a weakness yet. I use mine for everything from tame natural XC to Trail centre black runs. I've also raced 12hr solo on it and 24hr as a team.
I run mine permanently on 140mm travel. I used to drop the travel for XC races but last year at the Oktoberfest, I let TFTuning have a fiddle with it. They set the right pressures and told me to run it at full travel and I knocked 3 minutes off my lap time so I've stuck with that since then.
I was using an On-One Smoothie headset but last week I fitted a Hope unit.
When I fitted the Hope headset, I also fitted a 50mm Thomson stem, up until now I've been running a 70mm and I was happy with it, but I like fiddling.
Steve... I use Rock Shox Revelations, run them at 140mm all the time but sometimes lock them out for long smooth climbs.
Really like it. Best frame I've owned