If you are applying to several different schools using one generic statement will be easily recognized and just as easily dismissed. WHY _ because you will be seen as not making an effort sell yourself to this particular school, low effort equals low interest to admissions representatives. Remember the admission committee will likely view thousands of these statements from qualified candidates and they will spot a weakness, flaw or lack of attention to the process in a heartbeat. What you don't want to do is give this committee an easy excuse to dismiss your statement and application.
One must be able to provide the officers necessary information as well as give a good impression of their personality. There are some people who find it difficult to write about themselves, as they consider it as boasting. Still, one must mention their positive qualities though they do not feel it much. At the same time, there should not be too much of boasting. The academic officers will evaluate your ability based on the personal statement. Therefore, it must be clear and concise, grammatically correct and error_free. This statement might even form the basis of an interview discussion. So it becomes important for candidates to keep a copy of their statement so that it might be of use at the time of interview. As the personal statements are creative, one must use it to convince the officers why they want to spend three or more years studying the chosen subject at the university.