Otherwise, the Exos is a very light (three pounds) three-season shelter. It's a single-wall design, but rather than using expensive waterproof/breathable fabric, it uses coated fabric for most of the shell, with some breathable material in the door and lots of venting to get out moisture. It should work pretty well, but you can expect some condensation build-up.
In short, I think it would work fine for your through-hike. But because you like Sierra Designs tents, you might consider that company's Clip Flashlight ($189). It's a true two-person tent, making it very room for one, something you may come to appreciate. (In particular, it's six inches taller than the Exo 1). It's also quite light, at about four pounds, so competitive with most ultra-light tents on the market. Finally, it's double-wall design (canopy and fly) will ventilate better than any single-wall models out there. In fact, on warm, dry nights, you can just leave off the fly. The North Face's Canyonlands ($179) also is a tent that's proven popular with solo hikers. It weighs a bit less than four pounds, and has tremendous ventilation plus a big vestibule.