Do you have any experience with purchasing a GPS unit? Any mistakes?

Question

you learned from and features you would look for? I'm also looking for a good deal.

Answer 1

I've purchase approximately 900 GPS units due to my business (http://www.slopetracker.com).

The one thing I've learned is that you need to understand what you will be using the device for.  Answer that question and you should be able to find a device that meets your needs simply by comparing cost vs features.

If you just want it for basic outdoor activities like hiking, you don't need all the bells and whistles.  

I would, however, recommend splurging for a unit that contains a map of all the basic roads in your country.

If you need to buy it new, I recommend www.wintronelectronics.com

If you can make due with a used unit, ebay has some killer deals.

Hope this helps!