I've run a full complement of gear (gloves+jacket+pants+socks) off the Tiger and have had no issues. It's probably about 240W worth of draw, but I can't say it's ever run at 100%, as that just gets too hot! The dual channel is nice; I typically run gloves+jacket on channel 1 and pants+socks on channel 2. If I am running just gloves and jacket for the day, each go on their separate channel. As for the Montana, I also have a 60cx. No comparison. The Montana is MUCH easier to read, and the only thing I miss about the 60cx is the dedicated "mark waypoint" button.