What are their reasons for not using it? Nowt wrong with it as far as i know! There are probably better tools, but it does the job!
Hmm I disagree a little. The windows defrag is very slow and not as effective as other solutions out there. The best prog I've used is called O & O Defrag, it's a lot faster and alot more effective than the windows one.. Here's a link to get the trial version. HTH Pez