I got the Vinci X in December 2019. Have had some minor leaks, seemed to be associated with filling and sometimes not. Minor so far. .8 PNP coils. Coils seem to be the leak issue. I push them after filling and even spin a little to reseat.
Haven't broken any refill flaps. I don't pull on the flimsy little fill tab, I slide my fingernail under that to the seal bulb and press a little and it pops right open.
One thing I wasn't aware of is if an X or Vinci I suppose, sits for a while, it goes into some sort of sleep mode and in order to vape with it, you need one button press to wake it up, otherwise it's an air dry hit and a quick message to check the atomizer. After waking each hit is fine.