I got my BC just before Christmas and wasn't able to check mine with a feeler gauge until after the first time I used it. I found that the factory setting was a bit uneven... .038 on one side and .042 on the other side - got 81% mash efficiency on that batch. Based on some reading that I did, I adjusted it down to .036 on both sides for the brew I did yesterday and got 86% mash efficiency. I liked the look of the crush on this setting, and was happy with the efficiency, so I think I'll probably leave it at .036.
Somebody else mentioned that hand-cranking this thing sucks... I agree 100%. It only took about 1 minute for me to decide that my 18V DeWalt cordless drill would be used to drive this for the rest of the time I own it.