It's perfectly reasonable to be sceptical of Qualcomm's claims, but you can get a feel for how confident a company is in their product by how they approach marketing - and we are seeing a level of confidence here from Qualcomm and Microsoft that we have not seen with previous Windows on ARM pushes.
I am personally inferring from this that the products are probably pretty good, but this is speculation. I won't be ordering one until I see some test results from independent reviewers.