I think the movt the OP is referring to is the Miyota OS20 quartz chrono
or the OS10?
These are the same movts found in "designer" & tool watches all over the world: DKNY, D&G Time, LumTec etc.
i would be suspicious of any other "Japanese" quartz if it wasn't a Miyota, Seiko, Citizen though. Some "Japan" movts are assembled in China - big difference.
**How good are Japanese Quartz Working Chronograph Movements?
Miyotas are very good. Every watch I've had (and still have) with these movts have been almost bulletproof.
**Do they last long and accurate?
Every one I've had, have been fuss-free and only needed adjustment for date and maybe a minute out every 6 months or so.
Not to COSC std (obviously) but much better all-round (wear & tear, no worries) than an asian auto, a7750 included.