I recon multiple vials for most of my use as pens. Recon 2 vials, draw into syringe, filter into cartridge.@chmuse The whole loading into cartridges and sucking extra air out looks like a lot on "YouTube " ... does it become quick and easy to get that down to a science ?
I'll be set up to do a few pens at once and use one pen needle to purge the air. Plenty fast for me.