Tried refilling. Fill like a drug addict pulling out a little squeeze bottle to put drops into the carto, wipe, then suck. And then have to do it again soon after. Plus the refills are way more "smokey" than the SS ones and give off a tobacco smell or stale smell.
I have only tried one company thus far for pre-filled and pretty bought in to their batteries, etc. and with their price increases, carts that are not lasting and batteries that seem to die quickly, need to find an alternative company. Hopefully one that I can use what I have bought thus far as this is becoming more expensive than smoking analogs.