I remember telling me a while ago, but for the public, do you have any informations about the Trusty advised THB Daydates? GMF v12, even higher price class than QF?v3 is GMF, V5 is marketed as QF. It´s the same factory. "QF" is their new "brand" for the heavy models aimed for a higher price range. You asked for the difference? Well, they just added two links. GMF v3 weights around 175 grams, GMF v5 (QF) weights around 186 grams but if you fit the bracelet to your wrist size they weight the same. You might call this marketing or scam. It´s up to you.
And then you also have CY with the "record" weight of 200 grams. You might think "Wow, that´s great". No it isn´t. They have thickened the links by around 0,3mm to get this weight. So they are heavy but not genlike.
I wonder, what comes next. A super super heavy DD with a 30cm bracelet with super fat links? That´s all nuts ;-)