Pros weight, size, sensitivity, simplicity.
Cons no external memory slot, can not copy the files out of recorder. So, if the recorder fulls, you may only delete files to make room.
Summary If you are working with recording voices more often and need to file the archive of your recording, for instance you are researcher or journalist, this is not the right stuff for you. By only having 2 GB space, you only use it to record meeting, lecturing, interview, but after that you should make transcript as soon as possible.