I recently lost the small pen I carry around all the time, so when this pen arrived it had some shoes to fill. Although it's not perfect, I can say it's going to be on my person for quite a while.\
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The collapsing feature is terrific. It doesn't make a giant difference because it only adds about 2 more inches to the pen, but combine that with it's already short profile and that's actually substantial. Extending the pen reveals the ball point tip, and collapsing it hides it again. That's a nice extra feature that I wasn't expecting but really appreciate. \
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It feels nice and solid in the hand, but I've noticed that when I write with it that I feel the teeniest-tiniest bit of play with the tip. It's not enough to alter my handwriting but it's an odd feeling since I've never had a pen do that before. I've gotten used to it, but be aware that it's there.\
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The clip on the side is decent, but nothing exceptional. It does the job, helping the pen to stay clipped to my knife sheathe all day without me worrying about it falling out. \
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Finally, the stylus nub on the back of the pen for use with cellphones/tablets/etc... what can I say? It's like every other nubbin of its kind, it does the job. I personally don't use that feature at all because I have a Note 9 and I'd prefer using its built-in stylus.\
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Overall this is a good pen. Removing the cartridge is fairly simple so I foresee having it for a long time!