In reply to peter_ellwood:
Hi Peter,
I have the Quantum Tech's and really rate them for their light weight and natural swing.
The North Machine is indeed a replacement of the Quantum Tech. Differences seem to me a T-rated shaft, the new Grivel head design and a slightly smaller and more plungable pinky rest (maybe a different pick angle, but I'm not sure of that?). The North Machine looks like a more alpine-ice orientated tool, wereas the Quantum Tech seems slightly less specialized.
The aluminium version of the Quantum Tech is the Matrix Tech, which is also a really nice tool. Also discontinued, so keep an eye out for second hand pairs if you are interested. The picks on these axes are really beefy and replacements are still widely available.
Post edited at 09:42