I've used both Forster and K&M. WHatever you buy, make sure you get the neck expander tool from the same manufacturer, to make sure the expander mandrel and the turning mandrel match up in diameter. That being said, I prefer the K&M expander as it has a longer shaft with a less abrupt angle at the tip, plus it had an screw in the end to prevent you from pushing the case too far up the shaft and boogering the tip of the case neck.
And their power adapter for holding the case and connecting it to a power screwdriver is pretty decent too.....
Elkbane
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