Well, I've set off my H120 on a 5-min countdown, with the countdown timer displayed in the WPS (%bs).
It seems OK ATM.
/me waits breathlessly...
I tried it twice and both times it counted to ~ -40 secs (yes, that's minus 40 secs!) and then shutdown OK. No problems.
H120 using one of today's builds - r12667-070307