I put off buying SG for awhile since it did duplicate the basic features of some of my normal tools. Two things changed that, convert while maintaining folder structure (useful for Audio Ease Altiverb users) and Rapid convert which I now would not want to live without. Add to this the new variable normalize and this app has become indispensable to me. I use it everyday with hundreds of files and have had no problems, all smooth operations here (OS 103.7 and 8). When the Rapid Convert contextual menu plug-in first became available it did not work on my particular system. This gave me the occasion to experience their support which was 15 out of 10! Timely responses, detailed information and superb follow up. My every question since has been met with this same level of quality and attention. I am always happy to find both a must-have app AND a developer who understands the importance of customer support and strives to provide it with complete dedication. I am very happy with my purchase.