OT : Chassis punches

[tony duell]

This is rather off-topic, although I will be using said chassis punches for classic computer restoration

I am thinking of buying some chassis punches, in particular some of the ones for D connectors (and others).

One brand I can easily get in the UK is Greenlee. Am I right that that is a respected manufacturer of them? 
Not cheap, but then I can't afford the cheap ones.

Also Greenlee do an accesory called the Quick-Draw or something, a handheld hydraulic device that fits
on said punches. It is darn expensive, but I want to know what advantages it gives. If it is just faster then I 
am not interested. If it means I can cut thicker metal then I might be.

-tony