As far as I am concerned, the 7 bags sets are way too many. It just stretches out the time to produce and gives you a whole pile of grades that frankly I cannot really tell the difference between.

I find the 3-bag system is more than enough and gives you a #1 and #2 grade of hash. I guess the 5-bag system would also give you a #3 and #4 but I don't really think it is worth the extra effort and the cost to purchase a set with more bags.

Well thats my opinion anyhow.