i wasn't that impressed initially, but i kinda like the idea. i'm not sure how the memory consumption would be different than opening 30 tabs in firefox. afaik, they're all in memory too. even so, i'm sure they could do some dynamic stuffs by only loading the current tab +/- 1.
i was also pleased that switching back to a tab keeps your position, something i wasn't sure it'd do. the only real issue for me, then, is the shitty scrolling when switching tabs. just jump, damnit.