I used the small Wacom Intuos4 tablet and I absolutely loved it. It's more expensive than the Bamboo, but I also use it for Photoshop since I'm also a photographer. A big difference is that the "pen" has an "eraser"--you can erase just like as with a pencil. I can't emphasize how useful that is... The tablet also feels to be of substantially better quality, in my opinion.
I think whether or not a tablet is good for you just depends on your style. I really hate typing notes, and I dislike not being able to circle/point to certains words/structures on the powerpoint slide, so the tablet was extremely helpful, as well as fun to use, for me. I used the tablet everyday, for every lecture, after I bought it. I noticed a lot of people bought tablets during neuroscience, when we got around to the heavy neuroantomy stuff. But then most of them stopped using tablets once pathology started.
The tablet sits perfectly on top of a 13 inch Macbook pro, so the whole setup was compact for me. Combined with Curio, a software program, you can't go wrong! (If you have a PC, OneNote is the popular program for use with a tablet). I just save my ppt as a pdf, import the file into Curio, and leave a really wide margin so I can take notes, and I'm ready to go.
Personally, I prefer to write my notes on paper, using a pencil. But I spent a lot of money in biochem printing notes out, so I started using my computer to save money, as well as to have access to all my notes at all times. If you're similar and also prefer writing out your notes, then you might be one of the few who would enjoy/benefit from using a tablet. Otherwise, it'll probably only be of benefit for anatomy, neuroanatomy, etc.