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Some have awful interfaces but otherwise I can't praise the technology enough. My use has been offroading and vehicle navigation, not hiking. My customers use them for vehicle route tracking, and differential setups for mapping and automatic farm vehicle piloting down to cm accuracy. Very cool stuff.
The simplest versions don't store many waypoints. If nav is important make sure the one you pick has some kind of big visual or audio assist and easy access and downloading of maps. Car nav isn't too useful if maps are a pain or you have to pull over to read references.
If you don't mind used you can pick up great deals from people upgrading. Craigslist, ebay, etc. For first-time new purchases I'd stick with local shops vs. rebate nightmares via mail. You'll be learning which features are important and you may immediately decide you want those extra 100 waypoints or a bigger screen.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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