I know this is an old thread but thought I would share my two cents in case it becomes active again..
The big benefit in having a Scansnap is time. Not only for scanning a 30 page printout (for example), but also for how quickly and accurately it scans a page. No fiddling about with border detection, or wondering how you'll make a curled up document sit flat, just pop it in and away you go. Sure it's expensive, and you'll still use your mobile here and there, but over time and as an investment it is well worth it imo. There's a lot of paper out there.