Bought the Mi 11 Ultra during Shopee 7-7 flash sale, price $1250 (before $60 discount voucher), 12GB+256GB Storage White. The Ultra version is not available in SG. I bought this with China ROM, which means exactly what you will get if you bought it in China. Outer Box is vacuum wrapped. The phone, someone has opened it before as the inner wrap is not intact. Condition, it is new (if not 100%, 99.9%). It is heavy but manageable. Built quality, excellent. Charging speed, very fast. Google? Yes, but you need to download the Play Store fr the APKMirror site. App, all working except Chrome browser. I workaround by installing the Chrome Beta. Side APK load for the Chrome browser didn't work.
Auto Notifications, need to set App to 'No Restriction' and 'Auto Start'. Xiaomi is trying to manage all app to control the power consumption, a good motive but you may miss some notifications or syncing. Setting mentioned above will remove the restriction. Trace Together app, worked but need to change the above settings to make sure it runs all the time in the background. SingPass, works. For Messenger and Viber , I need to set Notification Rule to 'Important'.
Permission. For Yahoo Mail app, I have to allow Permission to 'Show on Lock Screen' so that I can get timely notifications. For WhatsApp, need to grant permission to 'Display pop-up' for video call notification. For Whatsapp and Viber, need to grant 'Read Your Contact' permission to make sure that contact name is displayed correctly in the app.
Calendar, if you are using Google Calendar, it needs to be installed manually. Xiaomi Calendar app can link to Google calendar. Google Contacts, can be linked up to Xiaomi Contacts.
Default China Apps, many of them can be uninstalled.
For those China App that cannot be uninstalled, try to disable the notifications. In the 'Restrict Data Usage', uncheck the WLAN and Mobile Data. In the 'Battery saver', set to Restrict Background Activity.
Overall experience after 3 days of using => Great Phone, China ROM is usable but not suitable for the 'Dummies'.