Thing I like about b3 is that I'm really rubbish at explaining things.
So normal custom bat.
I give my specs, they reply with, err don't get you on this bit, I try to explain more, they say gotcha, bat arrives, and the middles a tad to high, and the shapes not what I wanted. Close but not quite there.
With b3
I explain what I want, streaky says, errr, don't getcha. So I try again. He say cool I'll play on cad.
Day later get an email with a 3d cad drawing. I can then see my bat and say. Lower the middle, spine abit higher here, take some weight out of shoulders, toe spine abit more pronounced please,
Then a day later another 3d cad drawing, looks spot on that.
1week later bat arrives to the spec of the cad you agreed on.
When a bat arrives and is finished, you can shave more wood off, but you can't add wood back on,
With a cad drawing it can be altered over and over again until happy.