The iPad-killing Windows 8 tablet-laptop has arrived. Problem is, most aren’t ready to dispatch the iPad — or the MacBook Air for that matter — yet. So far, reviewers of shape-shifting Windows 8 tablets have not been kind. Otherwise known as “detachables,” the devices can take the form of a standalone tablet or attach to a keyboard base to become a close facsimile of a full-fledged laptop. And one of the key selling points — if not the key selling point — is that you can run all your favorite Windows applications. In other words, this isn’t application-deprived Windows RT. The fly in the ointment is Intel’s underwhelming Atom Z2760 processor, which presents itself as a kind of paradox: it promises to run any legacy Windows application, but it doesn’t really deliver.