1+
I had got an inexpensive, but beautiful neck on eBay only to "discover" that it had a twist...but I wasn't sure. I decided to try to set it up, and if that did not work I'd replace it (F type neck). It set up well and with no problems. It turned out that what I thought was a twist at first was really that the fingerboard was a little thicker on one side than the other. The radius was fine and the neck was otherwise straight.