Although SIRIF, the industry leading GPS sensitivity chip, was introduced about three or four years ago, Garmin, in the last 120 days, may have finally been forced to include it in what they are calling their "High-sensitivity receiver" eTrex series GPS. If it is SIRIF then you can expect acquisition that is 30 times faster than current units and (finally) a strong signal under trees, inside most structures, and in natural and city canyons.
If you are considering a new GPS you may want to wait a few more weeks to see if the new chip is in fact SIRIF.