prefer the BA
I bought this one and the Big Agnes Sleeping Giant to compare, and the Big Anges won. The foam either wasn't re-shaping, or it was cut VERY un-even. You also end up exposing the foam when you put your sleeping pad in and out (the BA has another cover over it's foam when you unzip the main cover). The overall quality of the cover was suspect as well... a lot of loose threads hanging all over the place. It looks like Therm-a-rest decided to compete with the BA Sleeping Giant and pulled this thing together in less than a week's time.
One thing that could be a plus is the soft texture in the Dreamtime cover. The BA has a very slick nylon, and my camp pillow is always sliding off. Although, I think the slick nylon is easier to clean than the plush texture. So that's more of a personal preference thing there.
And don't get me wrong, I like Therm-a-rest. In fact I am using a therm-a-rest sleeping pad along with my Sleeping Giant. Unfortunately I think they missed the mark on this Dreamtime cover.