My wife has had an iPad with 3G for a couple of years and I just got a WIFI only one as a hand me down..
Since I have started to use it I rarely get on my iMac any more..
Of course I'm not a power user like I used to be when I worked for a living.. But retirement has allowed me to stop being in front of a screen all the time..
Lots of my browsing is now on an iPhone and most of the rest is on the iPad..
Frankly I'll never own anything but Apple products again..Have several Notebooks including a Toshiba that is a piece of crap..
Owned nothing but PC's until my Daughter got a Airbook pro in college have bought nothing but Apple since..
Worth the money if for no other reason than not having to worry about viruses..
BTW am waiting for the iPad 2 and iPhone4S to come down in price..