im also confuse.. they said it unibody aluminum construction. But how can that be achieved if the whole back plate can be remove? But i have no doubt with the build quality. I still like Desire S frame design, which hold the entire body and frame using aluminum metal. Only that, the battery cover sucks.

Play around with htc sensation at lowyat just now.
-The sense 3.0 not as smooth as i expected as it is a dual core phone
-browsing is fast, but still can't beat iphone 4 zoom in/out.
-built is solid, but not as solid as Desire S
-screen display a bit washed out compare to Desire S, although both are SLCD.

I think dual core is not being optimized for android yet. Can't see much different with my desire s. I would say my desire s is much smoother while navigate around the menus. Even the seller also agree. Plus, battery will drain more than single core phone.