I've always found Chinese fabs OK if you don't mind waiting for shipping, or pay for the fast shipping, most of the time the PCB's are done within 24-48 hours, the remaining 3-4 weeks is shipping from HK Post, unless you DHL it.
However, around CNY everyone will try and get their orders in before the cut off, which means that they go balls out trying to get everything done, not always the best way IMO. So if I have anything super critical I always use a local fab house (or local in the UK), there is one called PCB Train, which is part of Newbury Electronics which I use here in the UK who do a good job, not cheap, but they will deliver, or you can go and fetch it if you are that way.