After seeing a fellow backpacker/bivy user get soaked in a Yosemite thunderstorm getting in and out of her bivy whilst I was dry in my TT Contrail I'm a total tent user.

I now have the even better (IMHO) TT Moment. The new UL solo tents are just so much better for so many reasons, i.e.
>bug proof,
>shelter for your pack,
>a vestibule for rainy/windy weather cooking,
>walls & floors to keep out creepy-crawlies,
>dry entrances,
etc. etc. (meaning that good feeling of having a "safe haven" during a bad storm, where you can sit up, stretch out, roll over and, in short, be comfortable)

"There are no comfortable backpacks. Some are just less uncomfortable than others."