Mine always worked well but its an early '07. Les told me that there was a revision in some later shocks that did not work well. I just got mine back from him and what he did was change the piston ring and resurface the piston faces. Other than that he gave it the thumbs up!
I had the same issue on my 07, sent it to Les, good as new (actually better, had it re-valved). Apparently there was an issue with some of the Sachs shocks but if it's worn out it will act the same way.