I read about scanR on Alec Saunders blog a few days ago, tried it with a single business card.
Worked pretty good - they mislabeled the company name (the 'logo' didn't OCR properly so they just took the email domain which would normally work but in this case didn't).
For some strange reason they also don’t realize 'cell phone' is the same as 'mobile'.
The VCF file download in the return webpage is a nice touch and makes adding details to outlook a nice touch.
Depending on how good their accuracy levels stay it's a nice feature and well worth the $29 a year.
Would I worry about mistakes and hang on to the card until it was returned in e-format, Yeh probably for important cards but until Americans wake up and understand QR codes (see www.cognation.net/contact) this is probably a good alternative.
(btw I blurred out identifying information for obvious reasons - also is it just me or do you see scanR selling the contact information to another company as they scan it .... )