Note I have no connection to these guys beyond being a very happy customers. I just wrote a post about this on my blog, but honestly the app works so well that I want to shout from the rooftops. Scanning directly to my iPad is one of the few remaining things I've had to rely on my iMac to accomplish. No more. I happily paid for VueScan, and my household iMac is one step closer to being retired so I can use my iPad alone. I only need to scan a few times a year, but when I need to, I need to. There may be other apps which do this, and perhaps do it well, but VueScan just works. Highly recommended.