I am new to vaping, but in my search for "the best" - I know it is subjective - overall rebuildable, it seems that Kayfun v3.1 ES, GG Ithaka and GG Penelope are the top contenders. Money, form factor and looks aside, which one would you consider to be the best overall delivery system in terms of easy of use, reliability and taste/vapor performance?
P.S. By the way, out of three models, only one Kayfun is currently available. Is there a reason for it (something wrong with this particular model) or is it because the other two have a more popular finish/coating? I am asking because they are usually not in stock.