Not me, I use a Vicmar clone from Grizzly... I know Cathy uses a Nova.. Can't think of anyone using the PSI chuck. If we don't get any hits here on this chuck, I'll see if anyone has any feedback from the pen turners site.
My problem with the Oneway or Nova chucks is the price. I can get a barracuda from PSI and get 4 sets of jaws for around $160.00, while the Oneway and Nova start at about $175 and only come with 1 set of jaws and additional jaws start at about $75 each. With money being tight thats a big savings since I can get it all for $160 and get the jumbo jaws for about $30 extra with the cuda.