Jordan Rudess isn't just anybody, he's one of the top keyboard players alive today. He's always experimented with alternative instrument interfaces and I think the fact that he's doing this on the iPad lends a lot to its credibility as a creative platform.
I also recently took it to Poland for a month and used it to compile a hundred pages of typed and handwritten notes and video footage--all the while using it to navigate my way around the unfamiliar terrain. I keep being surprised by my little sidekick's range of uses and flexibility...
https://www.amazon.co.uk/Sony-SVE1511M1EB-CEK-15-5-inch-Lapt... https://www.amazon.co.uk/Apple-15-inch-MacBook-Graphics-GeFo...
They are UK products, couldn't find a reasonably sized VAIO on Amazon.com. The VAIO has lower specs, though.
It's not a great device for making music. It's an adequate device mostly used by hipsters (and I use that term offensively) to look cool, sort of like how "writers" hang out in coffee shops using Macbook Pros (or various other expensive laptops, like Vaios) to "write" the next American Novel.