I have limited bar space on my commuter and have more stuff than I have space to put it so I needed an option. I liked the simplicity of this option over the Purely Custom accessory mount, even though it puts an item in essentially the same place. The construction sold me.
I bought one, intending to put my Garmin Oregon 450 GPS on it when I wanted to track a road ride.
It didn't work. The mount for the Oregon 450 is too wide for the Paul mount. I had to rework my plan and so I put the light on it instead, and it fits perfectly.
<a href="http://www.flickr.com/photos/8007861@N04/7322511568/" title="Paul Components Stem Cap Light Mount by mtbikernate, on Flickr"><img src="http://farm9.staticflickr.com/8144/7322511568_c702ea5905.jpg" width="333" height="500" alt="Paul Components Stem Cap Light Mount"></a>
More pictures and description of the details on my site.
Paul Components Stem Cap Light Mount Review | The GPS Geek
It would probably still work fine for a smaller GPS like the Edge models which use a different mount. But since all the handhelds seem to use the same mount now, I don't think any of them would work with this stem cap mount.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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