I've ordered quite a few of their 5 packs since I started in mid 2009. Probably around 10-15 5 packs of 510s and around 4-5 of their penstyles (I think they are actually RN 40-somethings, not 801s). Never had any DOAs, but did have maybe 4 or 5 attys total between the two styles that were mediocre performers (so-so vapor production, or funky primer flavors that wouldn't go away). I don't hesitate to order the 5 packs since it works out to be a pretty good price, especially when used with a discount coupon code or sale. 5 pack batts have worked out pretty well too.