I have a 95cm waist, and usually use 95cm belts, so I ordered size 100. It turns out that size 100 means the belt itself is literally 100cm and therefore way too small for me. In hindsight, it makes sense, but I wish there was a size guide.
I have sent an exchange notification on my order for a size 120 belt, and hopefully this will fit nicely, with a bit of 'wiggle room'.
The quality itself seems good, and I will update and change the review when I have the correct sizing.
-Christopher