It's also lighter and cheaper. The Copper Spur has side doors and a bit more shoulder space. I've toured solo with the SL2. It's nice and compact on the bike and roomy enough when set up. Because I'm from Colorado, I prefer a smaller volume on my tents. Less space you have to heat up with your body heat. Nights get very cold at altitude even in the summer. It's extremely easy to set up and handles downpours wonderfully.