Interesting and well done. As a tax lawyer I would refer people to this service.
The problem you face is pricing, I think.
I would not use it myself because of pricing. 1099 paperwork is an annual problem not a monthly problem. It is a discrete event problem rather than a flow problem. That's how I would buy.
Also, I have a dedicated internal controller doing this work now. I would have to see what's cheaper -- paying her to do things manually or paying for this service.
Advantage to you: simple and fast. Reduced opportunity for error.
Oh. Search for the word "gimick" on your site and add another m to it. :-) Tax is anal-retentive obsessive-compulsive work and you need to send the message that you never make mistakes.
Congrats. I needed this two days ago for my own firm and for my wife's business. :-( I will bookmark this for next year.