I use a Squall 2 (because I often hike with a partner and need the room) and it is fantastic. Weighs only 32oz. for the whole thing, uses one of you trekking poles for setup, and is as easy as any tent I’ve ever erected. Full bug net and excellent ventilation, but be sure to get any model with the sewn-in floor (I think all the current models come that way automatically now, but you used to have to order the floor.) Henry Shires and his people at Tarptent are first rate and there are no problems with their customer service that I’ve heard of (outside of a little confusion that their recent move caused.) If you want a solo tent, take a look at the old Virga 2, the new Contrail (it’s replacement) or the Rainbow as Postcard says above. The Contrail is listed at 24.5oz. on the Tarptent site. They’re great tents, probably the best lightweights going today.
That said, I may be abandoning mine for a Hennessy now that the Hyperlight Backpacker model is out. You might want to consider a hammock for solo, but it’s a more specialized choice and you have to be willing to change your camping style somewhat. Still, a Hyperlight now weighs in at about 21oz. so it’s a pretty impressive piece of gear. Problem is, you can either sleep in a hammock or you can’t, and even a Hennessy can’t make a hammocker out of you if you can’t. Their website is: http://www.hennessyhammock.com/
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