Black Diamond's BBEE scored very high in 5 of the 6 categories we tested (Weight, packed size, climbing utility, versatility, and comfort when loaded), but it received the second lowest score in durability. Only the REI Flash 18 scored lower in that regard. That being said, it is still made from a 210 denier material and if you dont plan on really abusing this pack, it should last quite a while.
The BBEE is not the best pack if you plan on only having one pack. The 12L size can be limiting, and the times when having such a small pack is preferable seem few and far between.
Don't buy this pack if you like to climb without a waistbelt. There is just no good way to keep the strap out of the way when not in use. Consider instead the Black Diamond Shot, which has a removable waistbelt, the Petzl Bug, with its stowable waistbelt, or the Cilo Gear 20 L Worksack, which has no belt at all!
If you are looking for something more durable and versatile and are not looking specifically for small volume, check out the Black Diamond Bullet. If you are looking for something superlight, consider the REI Flash 18 or the Cilo Gear 20 L Worksack (both are lighter than the BBEE with additional volume). If you want something even lighter AND smaller, consider the Black Diamond Flash backpack, a 9 L micropack (not reviewed).
If you want a small, fairly light, very comfortable daypack or climbing pack, then the BBEE could be the perfect match.