I've seen people get 10:1 results, as in 100g weed for 10g hash using normal ice and bubble bags or the sink-to-bottom method (with a plugged funnel at the bottom of the container you pour the water in, the hash settles to bottom, remove water up top, and then let the good goo out at bottom).
The traditional "put the weed on a silk screen drum and beat the trichomes off it" method seems awfully wasteful, would never consider it!
But yes, I'd prefer to just have 100g of weed LOL
Though I do get curious as to the difference in smokes that it apparently makes.