Rating: 5 / 5
I got this tent to replace my MSR Hubba because the SL1 is half a pound lighter.
It's not quite as convenient to get into and out of as the Hubba, but that's the price you pay for the weight savings. Also, the outward slant of the floor under the vestibule opening can let a minor, but annoying, amount of water in if aren't careful getting in or out in the rain.
I like the tent's volume and floorplan a lot. By having a narrow foot and wider head, the floorspace is put where you really need it: where you store gear. The headroom is good, but not great; my head and shoulders do brush against the mesh ceiling and walls when I sit up. However, I also brushed the Hubba's walls, and the SL1 doesn't feel the least bit claustrophobic.
The all-mesh interior makes it incredibly comfortable on hot, humid, still August nights in the Ohio valley; it's about as close to sleeping under the stars as you can come - with the added bonus of no bugs.
The tent isn't fully free-standing; however, if it's not raining, it's free standing enough. The foot end doesn't fully deploy unless you stake it out; you can also use a hiking pole across the foot end to get a reasonable approximation of free-standing. In the rain, with the fly on, it really needs to be staked out.
Also, pitching it is a minor pain: it uses clips to attach part of the body to the poles, but uses 4 fabric loops for part of it. The first couple of times, it was really annoying to thread three of the loops and realize that I'd missed the first loop. Now that I'm used to the tent, it's no longer a problem.
The tent packs small, pitches easily, and lives comfortably - I'm not sure you can ask for much more at this weight.