First welcome to the group and we hope you get something worthwhile from us.
As to the brands there are every brand and model known used by the cachers that I have met. But it seems to me that the large majority of them are Garmin. That does not say that the Magellan is not a fine GPSr.
I will say that the GPS accuracy contest at the Clarksville event last April there were only 1 or 2 Maggies in the top 10 and Garmin was in the first 4 places I think.
Good luck and welcome......poppy
May those who love us, love us. And those that don't love us, may God turn their hearts; and if he doesn't turn their hearts may he turn their ankle so we may know them by their limp.... An Old Gaelic Blessing