Reviewers report 9.5mm, not 8mm [1]. But the original Amazfit Bip is no longer for sale on their store or on Amazon except for overpriced marketplace sellers. They only make later models now which are thicker (they have a dizzying array of different models with similar names which is quite confusing).

I did purchase an Amazfit watch, the GTR 42mm which is supposed to be 9.2mm thick but is >11 in reality. "A couple of dozen" faces is laughable compared to what Pebble offered. The community produced an incredibly diverse set of faces and apps for Pebble. I find the quality of the GTR faces to be mostly poor with them all pretty much looking the same with the same features. For example, you can't do this on an Amazfit watch face: https://store-beta.rebble.io/app/57cc2c33be5ad0d9500002cd let alone the apps which have no equivalent AFAIK: https://store-beta.rebble.io/apps/most-loved/1

[1] https://www.zdnet.com/article/amazfit-bip-review-100-smartwa...