Glynn Cox did a demo which is on Utube courtesy of the Denton Wood Turners, it's the best I've see if you are interested in trying a cheaper handpiece to see if it is for you, If in fact you do try and like it all the set-up, save the hand piece and the hose connector, can be used if you want to spend the big bucks for an NSK.
Here's a link to the video. Incidentally in the notes under the video can be found a link to the PDF Handout he refers to. Well worth the look.
https://www.youtube.com/watch?v=5P8Zh_pI-tU
Pete
* It's better to be a lion for a day than a sheep for life - Sister Elizabeth Kenny *
I think this equates nicely to wood turning as well . . . . .