Small search indeed! I just spent an hour sifting through dozens of threads and so far have come up with these few links:
A general rundown of the accuracy of handheld gps units in 2007 (with positive recommendation for the Forerunner 305): Garmin Forerunner 305 - #4 by john_childs
Interestingly, it appears that elevation data is more accurate if you climb bigger hills: Garmin Forerunner GPS - #8 by tomblackwood
An older survey of gps units, in 2006: https://unicyclist.com//t/gkmacs-gps-survey/80961/1
Finally, and not quite on topic, it appears that aside from hoping you choose the right combination of search keywords there is another potential difficulty with using the search function: https://unicyclist.com//t/does-the-search-index-need-rebuilding/91006/1 Make special note of the second post in the thread.
I did what I could, I hope that if anyone has additional information about the latest crop of handheld gps units they’ll post it here. Legtod, I hope I haven’t mucked up your thread too much, I’ll go away for a while and (I hope) let others add information to this.