I was just wondering if anyone had ever tried this thing from mad vapes
510 SMART PCC
And if you have...could you please let me know if this is a worthwhile investment, especially since at some point I will have a total of four complete battery/atty combos for the 510
510 SMART PCC
And if you have...could you please let me know if this is a worthwhile investment, especially since at some point I will have a total of four complete battery/atty combos for the 510