I've been using for last several years the Garmin eTrex Vista Cx and HCx. We've used them for mountain biking, kayaking, backpacking, bike touring, and in the car. Both units have taken us been deep in the back country under heavy foliage and across countries like Poland, Slovakia, Romania, Hungary, Czech, Germany, and the U.S.. I still own both; however, my Cx model decided to go a little crazy during our last Euro tour (Sept 2011), so I will be replacing it with either another HCx or Garmin's new eTrex 30. I would prefer another HCx just because their new eTrex models have a new mounting system and that would require having different setups and I like keeping everything the same on my wife's and my bike as possible.
Hope this helps and what you were looking for. If you have any other questions please feel free to contact me or post your question here.