I can confirm anecdotally the popularity of their Xiaomi Mi A1, which as the code name suggests, is the one Xiaomi model that comes with Android One. Stocks have been low locally (SEA) since December to the point where shops have begun to sell the Mi 5X, the mainland China variant that comes with MIUI. In fact, there are hacks that enable the loading of the Android One ROM, if you can somehow bypass the locked bootloader.

Their other products are actually widely distributed outside the US, even if availability is spotty. Their fitness trackers, power banks, and their Bluetooth-enabled so-called* smart scale are quite popular. (*Does adding a wireless security hole necessarily turn an electronic scale smart?)