Neil, the Storm is alot lighter than its older brother the Turbo. One less vaccum motor (and maybe other changes?) have made this possible.
I have an Airflex and its very easy to move about.
I also have the Airflex turbo and have never had a problem getting it about and i am a skinny wimp, does this have the same motors as the Jaguar ? i agree that looks are unimportant if the spec is different but all things being equal would you rather have a machine that looks good and shows your customers you have decent impressive looking equipment