I have the Xiaomi Mi4C, which gets an OTA update every week. Most changes are cosmetic, but typically includes substantive android security updates at least monthly.
I got a xiaomi redmi note 3 about a month ago and received two updates already, the second one is miui 8, I have 7.5 right now, but I won't update until I know is stable enougth
I have had samsungs and motorolas, and updates were few and slow.
Yeah no software updates aye, I probably get a minor security fix once a fortnight and have had a major os upgrade within a week of my phone arriving (xiaomi redmi 3s). I have owned about 5 different China phones, thl had awesome build and occasionally update. Xiaomi has had the best update frequency tho.