Have an iPad first gen here, great piece of kit and does me for what I need it for.
Thing about these tablets is, when you get them, I don't think you really know why you get them, but you will always find a way to utilise it or incorporate it into your daily routine.
For me, it's completely replaced my netbook I use for surfing the net. I can ly in bed with it in a comfy position and respond to mails etc.
The fact that it's instant is great as well, not like a laptop where you have to boot windows, leave the iPad on standby, and when you need it instant access.
As for travelling with it, its brilliant, I travel over to the UK now and again for work and it's great for the plane etc. Battery life is amazing and much better than bringing a laptop/netbook around with you.
As for the whole thing regarding iPad Vs. Android - have a play with a few different ones before you decide, don't purchase cheap chinese crap, you will regret it, I know a girl who purchased an Android tablet off ebay and it lasted two days before the touch screen started acting up. As for build quality, it was a horrendous plastic feeling, which felt like if you were to drop it, it would break/crack.
I've an Android phone and it's a great operating system, much better if you're a bit of a geek like me as it's not restricted in the way the Apple's are.