No idea what a birchbox is but diy is probably more fun anyway and def not a waste of $.
my protank lost all flavor on the 5th day after about 10 tanks put thru. washed it out, cleaned the wicks, dryburned a lil, rinsed again, quick dryburn and...nothing...no flavor anymore. changed the head and it's perfect again. So it seems its weakness IS the heads which isn't a big deal cuz if the evod heads fit (i'll find out tomorrow) they're only $1 a piece so changing them every week's not a big deal.