Bought it about a month ago and was initially impressed- decent vapour with good flavour . Vapour quality never stayed good unfortunately and now the real rub - the “ heat sink screen “ in the bottom of bowl is forever going going gone. It’s very small, and the unit is almost useless without. Now these screens are about 2 by 3 mm: do spares come with unit,no which sucks I ordered a pack of 5 more which were relatively cheap, except for shipping.NOw these are gone. Seems like a design flaw- a big one This unit costs good coin,save yours