I did An Teallach in June of this year starting from the Sail Liath end. The pinnacles look extremely daunting from the summit of Sail Liath but they lost some of their menace the nearer I got to them. Mind you, it was a gloriously sunny day and things have a tendency to look better in the sun rather than surrounded by mist.
It's not easy to judge the difficulty level as everyone has a different threshold with regards to difficulty and also exposure. I live in Devon and have climbed most of the Dartmoor Tors. Although made of a different type of rock the An Teallach pinnacles are very similar in structure to the Dartmoot Tors - flat sections of rock laid on top of each other - and I found them much easier to climb than some of the Tors. In saying that, the pinnacles are perched on top of three thousand foot of mountain, which doesn't half get the adrenalin going.
I have heard that they are slightly easier to negotiate starting at Sail Liath, although this is probably due to the down climb on the first pinnacle (or last if you're traversing them the other way). I tackled them end to end and that first pinnacle is not easy head on. I remember shuffling across a narrow ledge half way up trying to find some decent hand-holds and I was pleased I was climbing up rather than down. The path actually avoids this on the left hand side and comes up between the first and second pinnacles, so there is no need to attempt it if you don't like the look of it. After that, the other pinnacles are relatively easy scrambling, although you most definitely need a head for heights. I scrambled up and down Stannage Edge as a kid and exposure doesn't bother me. Normally, I don't even think about it but during my traverse of the pinnacles I stepped up onto one of the tops and, out of the corner of my eye, I caught the drop on the right hand side into Coire Toll an Lochain. It was a very sobering experience.
One more thing, Lord Berkley's Seat is a big disappointment if you traverse from Sail Liath. You step onto it at the end of the pinnacles and you get no sensation of being perched up there on an overhang. I didn't even realise I'd been on it until I looked back from halfway up Bidein a'Ghlas Thuill and saw where I'd recently been standing.
Cameron McNeish said that doing Ben Nevis by the tourist path and not seeing that great rock face is like going to the beach and not seeing the sea. I think An Tealloch is like that. You have to traverse the pinnacles, otherwise why go all that way? I still wish I had turned round and reversed back over them the day I was there. It could be a long time before I get that chance again.
Edited: 24/08/2009 at 14:55