Good service from Chinese Visa Direct
I posted off my passport on 9th June , on 10th June i got an email from them confirming they had submitted the passport to the embassy , telling me them expected to get it back 15th June.
Today (15th June) another email from them telling me they have posted the passport to me and giving me the special delivery ref number.
I like the fact they let you know whats happening , i wasn't to keen on posting my passport but had little choice due to distance / time etc ..