To be honest with you, I never would have bought a tablet on my own accord. I have a decent desktop and a 17.3" laptop that is powerful enough to do your dishes if you dropped the cord in the sink, lol! Between the two, they have done everything I asked and more. The problem came when I went back to school. Unfortunately, with all that power (in the laptop) comes a relatively enormous form factor which I don't mind so much, almost 10lbs of weight without the power cord, and a pathetic battery life. Given that, I have to carry the cord because I don't have enough power to get through my school day without it and it alone weighs at least two pounds. I am a large man but I have had my spine fused at the base of my neck and carpal tunnel in both hands, one of which was also operated on. Add to all that a 20lbs accounting book I have to carry four days a week, and books for my other classes, and you get the picture.
All that weight was aggravating my neck and hands so I looked into tablets as an alternative and ended up buying a refurbished tablet with a 10" screen and built-in qwerty board. For a tablet, it has great power, a long battery life, and decent storage, which is expandable via integrated an microSD slot and USB port, all at just under 2lbs. So what do I use it for? School work (a program gives me full M$ Office integration for documents in 3/4 of that suite). All my work gets saved to a thumb drive and gets moved to my laptop when I get home. What else...how about reading the scriptures, listening to the radio, church work ( all the manuals, hymns, most of the docs my church puts out, and a few books written by authors from our religion are accessible via download), surfing the net, writing the occasional short email, watching movies online, taking pictures, playing games, using a PIM/calendar app, entertaining my kids with games, research, geneology, shopping online, and that is what I can think of on short notice.
My tablet is for me something that I didn't know I needed until I had it and now I don't know how I got so far without it as it has made my banged up world a lot easier to get around in. Will it replace my desktop? Probably not, and it for sure will never hold a candle to my laptop but like others have said, it serves a solid purpose in my life and will be around for a long time to come. I have to disrespectfully disagree about the claims that it's a fad like the netbook, simply because it has so many uses (current app count is 750,000 and growing). Maybe a tablet like device will come out that is even easier to use and carry and is even more powerful than a low-end laptop that will bring evolution to what we use, but I don't think the tablet platform is going anywhere any time soon. I also want to echo the sentiment that if you don't have a use for it, don't buy one. I consider them tools as much as toys and as such, would you buy a tool for a profession that you aren't in, just because they look cool, or have a "brag" factor? No. You buy what you need, for the tasks you have at hand. Carefully consider what you do in your personal and professional life and decide if it wouldn't be made easier with a tablet. If the answer is no, don't get one, but try to remember that just because you don't see a use for it in your world, doesn't mean that there is no use for it in anyone else's. I remember when pc's first came out that it was said by many people that these "gadgets" wouldn't last and that they too were just a fad and now look at them. So what did I type this on? My laptop, lol, but only because my handy little refurbished tablet had a bum speaker and is in the process of being replaced. Otherwise, I would have used it.