How do you evaluate a quantum computer you just bought from D-Wave for $15 million? It's not easy, especially since no one can really understand how the machine -- with its ones, zeros and superpositioned "one-and-zeros" -- actually functions. Instead, all you can do is throw increasingly complex questions at it, and hope that it answers them quicker than a top-end classical computer. This quest for evidence of so-called "quantum speeedup" has been going on for a while, with little in the way of positive results. Now, a freshly-published collaborative study involving Google (owner of a D-Wave box), Microsoft (owner of some very advanced traditional tech), and a team of university scientists, has achieved new results that are equally disappointing. Science magazine describes the study as "the fairest comparison yet." D:Wave's founder, meanwhile, has described it as "total bullshit."