I have 2 older GPS units, Magellan SportTrak and a Garmin GPS 60. The Garmin is my go to unit and works well for biking and hiking. But the newer color units have some appeal. The Garmin Oregon 600t has a sd memory card slot and will use GPS and GLONASS, waterproof. The TOPO maps for the US and Canada are $100 extra but really look like a feature that sets this apart from the older units. The Montana 650T looks like a nice unit with the TOPO maps loaded and a camera. Quote: Load TOPO U.S. 24K maps and hit the trail; add Trailhead Series TOPO maps and explore famous treks like the Appalachian Trail and the Pacific Crest Trail; plug in BlueChart® g2 preloaded cards for a great day on the water; or load City Navigator® map data for turn-by-turn routing on roads. Add satellite images to your maps with BirdsEye Satellite Imagery (subscription required). You can even display and enter grid references in Irish Grid (IG) or in the new Irish Transverse Mercator (ITM) grid. Any thoughts on this unit or others?