Martin, one area where my Grex 23 gage pinner gets a lot of use is actually for "jigging up"...very handy in that respect, especially when you want some thing temporary and easy to rip apart after the fact. It's also been very useful for attaching very thin/delicate appliqués and other similar things in projects to hold while glue does its thing.
It took me a little bit to get used to the "double trigger" type safety on the Grex, but I actually like it. My older Accuset by Senco has no safety and it probably qualifies as a weapon as a result.
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The most expensive tool is the one you buy "cheaply" and often...