Has anyone had the opportunity to use an HP 2215 with Bluetooth GPS? Better yet if you have, were you able to compare it's performance with a Garmin Street Pilot III? Both are expensive when maps are included, and being retired I can't afford to make a mistake in purchasing the wrong one. I understand the Garmin is the standard to compare with, but the bluetooth method would save me a little money, if the performance is similar/equal.