I've always thought the weight wheenies website should provide a particular web page JUST for claimed v.s. actual weights by percentage off per manufacturer, so a visitor could quickly see of the (hundred?) manufacturers which is most honest in G.C. (Grams Claims).
It can be pretty disapointing to spend more for less only to discover you still got more.
I now only purchase if seller is guarenteeing the weight within 5 or 10%. I've discovered many will not on a particular item, but will on another... indicating which manufacturer is honest.