where to start....i had my atty's for like 3 days before they started giving off this metallic burnt taste and smell.., 4 510's and 2 M401's ., it's bs... i spent nearly $200 on all this.., and it broke within a week of using it.., and its cool broh save your atty ! you never know when you might need it. I'm trying to contact the person i bought them from but he seems to reply like a million years later... fkn frustrating big time man...