This particular Bulk Barn is immaculately clean (read, they are constantly vaccuuming around the containers) and the staff is friendly and helpful. The product is also extremely fresh, I have never encountered any staleness from anything I've purchased here.
Note, the best buys are spices, baking ingredients and supplies, but things like rare nuts (macadamias, cashews), chocolate, dried fruit (everything but raisins) and snacks are somewhat overpriced compared to what you could pick up at a Loblaw or Costco pre-packaged.
Otherwise, support your local bulk food store!