OK, first - I don't know anything about transit visa, all I know is - if you don't have proper chinese visa - you'll sleep on the street, because no hotel will admit you without visa. Transit visa do not allow you to leave airport, and you could be arrested, and pay fine (5000 yuan). Second - if you'll ask a taxi driver to bring you to "watch factory" - he'll refuse to work, until you'll give him an exact address. Third - no taxi could bring you to the watch market, they drop you 2-3 blocks before it. Fourth - when you exist GZ International Airport, new one, bot an old Baiyun, which provide only flights inside China, you'll be surrounded by at least 10-15 people, who will offer you "taxi", but they're not a taxi drivers, the line for taxi will be about 100-200 people. If you'll succumb, and take any of these "taxi", they'll ride you for at least 2 hours, and demand at least 400-500 yuan for the trip. Real taxi cost 180 yuan. Best way is to take the bus #4 and go to Dongguan hotel, where you can easily get a taxi to watch market area (if you speak Putong Hua, of course), for about 25-30 yuan. And the last - ecven if you'll reach watch market, and if you're without chinese guide - you'll pay 800-1000 yuan for crappy 21j or quartz watches. Don't even think to find anything with ETA, clones or A7750, it doesn't exist there. Been there dozens of times. Here's a few pictures.