I think it's a very compelling product if it delivers what it advertises. Unless you're talking about a kindle your tablet most certainly isn't better when it comes to reading which seems to be a significant portion of the product's features - as much as I like my iPad, reading on such a display for long periods of time is a subpar experience.
For me it is about having one device that focusses one one well defined task and does that well. To minimize destractions. A tablet can do so much that I'd be tempted to do a lot of other things except reading (and scribbling).