I used the form provided by Allied Passport & Visa on their website. Under Business or Tourist requirements click on the "China visa application" to access the form and save it to your desktop. I didn't have any formatting problems.

The form is the same no matter where you download it from, of course. It's just the formatting in the fillable boxes that differs. Unfortunately, I don't have Acrobat Pro, else you're right, I could just alter the formatting to fit my nitpickiness. :)

That one worked pretty well. The only problem was that it didn't have a text box next to the 'Other' line in the number of entries section, where I could indicate a 10-year multiple entry visa, but that's not the end of the world. (Oh, and one box had a different font than all the rest--completely unimportant, I realize, but...why?)

I used Allied to get my visa and I just checked "other" and did not specifically request a 10-yr per their instructions. I received a 10-yr M visa. Here is a link to their application instructions which says the embassy will issue a 10-yr at their discretion.

As of a few years ago, all foreigners are required to provide the exact address of where they'll be staying when entering the US. This question of you wasn't just in response to you claiming to "visit relatives."

On the blue form, it was part of the questionnaire.

This was asked at land crossing at random where blue form was not required. Maybe 5% of the time.

Still being asked. I had to pull out my hotel reservation last month when crossing by car to go catch a plane in Vermont.

I have a 10 year Q2 visa, which is for visiting family [and friends?] (which I have in China). But say my next visit is mostly sightseeing by myself, with perhaps a little bit of family visit. Can I, technically, enter using my Q2 visa?

Once you get the visa, it doesn't matter.

So it's fine to check "sightseeing in leisure" as purpose of visit on the arrival card and tell the same to the immigration officer (if asked)?

Yes

Maybe I should have renewed my passport last year. My passport expires next year, so I'll have to renew it, but last year I just got a new 10 year visa good until 2025. Since the visa cannot be transferred to a new passport, I'd have to either travel with 2 passports from 2017 until 2025, or get a new 10 year visa and pay another $140.

I've seen a lot of advice in this thread and others recommending that people just do things the simplest way (the way that's least confusing for airline reps, immigration officials, etc). There have been agents who have refused to check pax in because they didn't know about the 72 hour TWOV policy for China. Anyone see problems with agents not knowing about an old visa in an old passport still being valid for entry to China?

People having problem with TWOV is pretty rare. I understand that you can transfer your visa while in China.

That would be nice. Where do you go?

Please tell me where I can do this. Everything I've seen says that you either travel with two passports, or you apply for a new visa, but existing visas cannot be transferred to a new passport.

Theoretically, you would go to the main Entry-Exit Administration of the Public Security Bureau in a given (major) city. They are the only group with the power to do this. For instance, in Beijing, this is at 2 Andingmen East Street. In reality, the officers on duty may or may not agree to replace your USA-issued visa in the new passport, and there is no word on whether they will charge a fee or not--we just don't have data points yet on this. What is certain is that it's likely to take a week for them to process, based on how they handle other categories and situations of visa changes.