Is this the correct QCTP?

[stevec]

(04-26-2013, 06:39 PM)marfaguy Wrote: Hey guys.
I'm still on target of getting a Grizzly G9972Z 11x26 Lathe this summer. I also want to replace the 4 way tool post with a QCTP. As I understand it a wedge type is preferable to the piston type (although I maybe wrong about that). Anyway I think this is the appropriate one for a lathe between 9" - 12" swing.
http://www.amazon.com/Quick-Change-Tool-...002YPDQ4G/
It even says so in the description but I'd like to get the opinion of the more experienced members on the
forum. So
A) is this correct one?
B) Is the wedge type better than the piston type?

Firstly, I may not qualify as one of the more experienced members of the forum but I have found that the BXA piston style QCTP I have on my 12 X 37 lathe is excellent.
I have a BXA wedge type on my 16 x 60 lathe and I seem to notice a loosening of the wedge during use. I don't know if it's due to the cheaper quality of my QCTP or a characteristic of the wedge type.