Flew from fukuoka to Shanghai on 144 hour. It took almost 20 minutes at FUK to process through with the Japanese ticket agent. She knew the program but being Japanese was very detailed and asked for more information than was necessary.

In Shanghai the customs agents were super friendly and there was already a twov special agent on hand (about 2pm). He accidentally processed me for 24 hour until supervisor checked and saw my flight out was 6 days later, so they had to reinput the info. A handful of other passengers were also applying for twov.

Leaving shanghai no problems.

I would actually fly twov more often as it gets you out of the general foreigner line and you can process through customs faster.