I am the director of operations for an outsourced accounting and finance company in San Diego, CA. We paper filed 1099s last year for 50+ clients. It was a disaster. Not only was it terribly inefficient but we weren't able to bill back most of the materials due to being unorganized. This year we moved to tax1099.com. We successfully filed 71 clients (91 entities) total. We approximated our time savings of 350 man hours which resulted in tremendous client savings and allowed us to spend more time on value add activities. We estimated that our cost per 1099 dropped from $50 to $30 when you add prep, review submission at various billable rates + filing fees.
I'm glad we used Tax1099.com. I hope they improve the speed of their website next year. That was the majority of our teams complaints.