We did some pretty meaty trails over the weekend.
The Devil's staircase is an excellent trail- even at the end of the 20 mile loop we did (along the West Highland Way, up DS, down DS, along to blackwater dam, down Ciaran, up the DS then back down and home). Rocky but fast, open, flowy with tech sections you can just batter through.
The Ciaran path was trail of the year in MBR and it was OK but not my cup of tea- I prefer something steeper but there were some cool really tech bits.
We did Ben Nevis the following day- this is a staggering technical challenge. Really tough. You could steam roller a lot on a DH bike but on the Norco it was seriously tough. Not completely rideable, but about 80-90%.
Here's some pictures. http://picasaweb.google.co.uk/lleebb76/Glencoe#