I've been living in China with my Chinese wife for the last four years. My visas were extended L visas, easily renewed each year.
Now, with the new visa categories, I have been issued with a Q2 visa for 180 days only. I have been assured by the PSB that it will be readily renewed at the end of the valid period. The visa allows for only two re-entries, as opposed to multi-entries on the L visas.
There are two aspects of the new Q2 visa that leave me, for want of better words, quite breathless. Firstly, on each application, my wife has to present a letter "inviting" me to "visit" her in our shared apartment where we have lived for the last three years. No comment...
The second aspect is a real head spinner and free-wheels deep into Kafka territory. On the bottom of the visa are two notations, one in Chinese and the other in English. The English notation states that I'm "Permitted to stay until (date of expiry) for this time, and to stay for 180 days each time since the next entry." Say what?! My wife read the Chinese notation and explained it thus: After using the first re-entry, I begin to use, from the date of re-entry, the 180 days of my next visa (which I would apply for at the expiry of my current visa).
If your mind can't get to grips with this, the following may help. My Q2 visa was issued on Sept 1st and expires on next Feb 27th. On Sept 29th, I may have popped down to Hong Kong for a quick visit and re-enter mainland China the next day on Sept 30th, 30 days after the visa issue date. Now, according to the notation on my visa, I have entered the "stay for 180 days each time since the next entry" period. So now I'm living in China on the 180 days of my next visa, which I will apply for before Feb 27th. At this point, my new visa will be valid for only 30 days, as I will have already used 150 days of it since my return from Hong Kong.
Imagine if I had gone to Hong Kong on Sept 1st and re-entered the next day. My next visa would have expired before I'd had chance to collect it!