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Long battery life, very tough, very cheap and you can use it on a hike if you want. Little nubbin can be used with gloves easily.
Because the batteries are AA buying a second hand one isn't so much of a gamble, also they're theoretically live longer.
They're designed as navigation more than cycle computers though, so I think some cycle computer whizz bangs like displaying power meter readouts on screen or whatever don't work as well.
Really I would ask yourself what the advantage of a dedicated cycle gps is compared to the etrex rather than the other way round. And if you can't justify the price for the added features, get a second hand etrex.
Also, what's the benefit of the Etrex? Better battery life/uses AAs for touring? Assume it can still be bar-mounted? Thanks GPS experts.