Traveling companies for pets

Hello, I will be arriving in Beijing beginning of January, with my family and our 2 cats...Looking on the net I have seen that some pet travel agencies in Beijing are offering the service or sorting out everything about the entry of the pets in the country and even making the quarantaine go shorter. Could anyone share with me their experience on those agencies and if you had the chance of working with a serious one, could you please recomend it to me ? Many thanks.