I have used them several times and would like to make a couple of points: 1. Came in a case that does not have compartments for ALL the bits. So I just put the small parts in whatever compartment they fit.2. The suitcase they arrived in has neither a latch nor any reliable lock. In fact, the case was opened during transportation and all the parts fell out.3. Even though they look straight, they make my drill bit wiggle when I drill, so it's likely they're only slightly crooked. After all, they do their job and I might get what I paid for, but anything worth the money shouldn't be particularly bad.