I was bought these last Christmas and only recently opened them.
As an artist i am not sure how i have got this far without a good set of pencils. I have always been disappointed with pencil sets no matter what price, i had never seen the point in them and sticking to my trusty staedtler HB (maybe they did work fine and i just didn't know how to use them). So i opened this pack with not much expectation and was really surprised.
The B's are really ever so soft which is great for shading and layering and making some nice dark lines. More than you could hope to get from any HB.
The H's are too hard for me to use, but can be used as a lighter shade if used carefully..? Likely for much tidier work than my own.
Since i've never really used them i'm not entirely sure how the letters are supposed to differ, (there's an F in there! suppose Novice here has never ever heard of that) but i hope this is useful.
In short this is a great cheap pack.
I am very pleased and will probably buy more.
I'm sure Students and hobbyists will be similarly pleased.
(Mine looks like the 2nd picture/the more open pack)