I'm using mine for a lot of things that do require fine detailed work - like drawing, extracting etc. I still use my mouse for the "regular" work and only pull out the tablet only when I need it. My keyboard is still right next to it for easier navigating using the keyboard shorcuts.
I'm using an older one, the Bamboo Fun CTH 661 with a drawing area of 6 x 9 in. I wouldn't recommend getting a smaller one (I had one and passed it on to my daughter). You might want to think about having the touch-function ability - I hardly ever use mine, being not a touch screen person, lol.
Another option: if you have a tablet (iPad or similar) you can use that as graphic tablet, as well.
Feel free to pm me if you have any more questions