Nice Project Pack -- Pro Tip -- Order by board foot for length requirement.
I ordered two of these project packs and was overall very happy with the quality of lumber received.
However, there was a hiccup in my order in which I received mostly boards that were under 6ft (most boards were 5ft and 4ft). The product description is a bit ambiguous -- implying that most of your boards should be at least 6ft -- but that isn't a guarantee (as in my case). The customer service at Woodworker's Source is excellent, and they worked with me to resolve the issue.
That being said, if you order 6/4 lumber not in the project pack -- you can request a minimum length (w/o a selection request charge). The overall cost is roughly the same as a project pack.