Originally Posted by gpsblake
Usually not the case unless you haven't used the unit in a while. I almost always acquire a signal in under a minute.
A minute? Versus zero seconds for a standard bike computer? Perhaps I'm too impatient, but that's a long time to wait when the road is calling me.
Other downsides:
Cost (they typically cost 20-30 times what a decent bike computer costs).
Battery Life
Size (though some of the newer models like the Edge 305 are getting smaller).
I think the edge in terms of value still goes to the standard bike computers...but, this may change with the next generation of GPS satellites and receivers.