i have been turning for 5 years now, and followed the typical Vortex Path. I purchased from PSI some turning tools and a scroll chuck. Of course, over time I have added better tools from Crown, Sorby, Thompson, and others. I also have added chucks from Nova, Vicmark and others. My curiosity has been piqued by the different performance of dovetail jaws and the straight sided PSI jaws. It seems that often times when grabbing the outside of a tenon on a bowl bottom in order to turn the inside of a bowl, the dovetail jaw chucks don't seem to run as true as the straight PSI chuck does. I clearly dislike the bevel gear type method for tightening the PSI chuck, but I will reach for the PSI usually when I am turning anything but a very hard wood. I think that the dovetail jaws can compress unevenly on the softer woods, cut into the tenon sides unequally, and get itself out of balance and run with a slight wobble. I seem to get this result often, and the difference is quite noticeable. Of course it is not so great that I can't turn the item back to round, but there is a difference. Now, I would surely not recommend the PSI chuck over other chucks as the dovetail jaws seem safer, and the better chucks are easier to operate. Hopefully I have explained myself clearly, and if so does anyone have this experience or ideas on this? By the way, all of the chucks (I have 5) run true when alone on the spindle. And none of this has prevented me from turning (and selling) 150-200+ items each of the past 3 years.