I'm sure this topic has been dealt with thoroughly already and all are sick of it, but here goes:

Is it feasible to use a Pogoplug as a home file server (I know of the driver download needed) to replace an old (2004-ish) Windows box?  It will only up/download doc files, MP3 backups and occasional biggish Photoshop files (50-60MB).  I feel fairly sure that it is possible to do this but wonder how noticeable the lag before the HDDs spin up and if the download data-rate is perceived as draggy?  

I hope that asking this here will get me informed views rather than just wide-eyed fanboys or grumpy professional complainers!