I’ve had an early PUK and replaced it with an Orion 150i. I sent the
Orion back for reasons detailed at
I now have a PUK4 and am very satisfied. If you want to get stuff
done with a machine set up for goldsmithing, you want a PUK4. If you
can get a PUK3 cheap, do it. If you are buying new, the PUK4 is far
superior.
Judy Hoch