Excellent for the research organic chemistry graduate student or the pharmaceutical industrial research chemist who likes to start with the purest materials, so as to leave only the investigative variables open to question.
However, in industry, although FedEx-ing new and pure reagents (and disposal of the old questionable ones!) is the easiest and encouraged method for research, it is often found that purification is totally appropriate--in these instances, Purification of Laboratory Chemicals (D.D. Perrin & W.L.F. Armarego) is highly recommended.