I love em with the metal blade. I've gone ahead and epoxied the plastic heads to the main bodies though. Losing those things into the rockwork when moving across panes gets old real quickly. I don't work with much acrylic, so the metal blades stay on exclusively.
Protip: I don't know when, but sometime in the last year, they started hiding the metal blade in the instruction manual. I've tossed out more than a few (I go through a lot of magnets) unwittingly.
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This and that.
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