One thing to beware of if you're not familiar with the Tree collet closer:
Overtightening the threaded collet retainer ring will allow the collet to close without the closer going into its detent, often without the collet springing open afterward.
An operator who's not familiar with the Tree system may well overtighten the retainer ring without realizing that the collet closer even has a detent, think that the collet is held closed by friction, pull the handle snug, and start working.
There might even be enough friction in the system to hold the collet closed through a week's worth of tool and collet changes . . . but sooner or later, a collet will spring open and spit out the cutter, usually in the middle of a heavy cut.
When someone else in the shop knows how to use the Tree collet closer correctly, that knowledge is passed along to the guy who just experienced the tool spitout. Sometimes no one in the shop knows how to use the Tree collet closer, and in that circumstance there are often several others who've experienced Tree tool spitout.
Which explains why so many small shops have (or had) a hardly-ever-used Tree pushed into a corner and covered in dust.
John