They really are rubbish.
They really are rubbish. Because they feel right (RPM80) and seem to do the job I stuck with them but now have a stack of dead ones - they ALL leak and die after a few weeks - a month at the most, and I only vape at weekends! I got in touch with them and had to provide photos of all the dead ones WITH DEEP SCRATCHES THROUGH THE SCREENS that they insisted I do. They eventually sent me a new one. Guess what - ten days later it died. I have now found another brand which seems not to leak. My advice - avoid Smok unless you like throwing money away.