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As someone who has provided a similar service for well over a year, I say "welcome" we need more of this. Spread the feed spreaders. Granted, Howell D may be correct that not many of the services, myself included, syndicate Atom feeds, though I am hard pressed to see what Atom offers in syndication basic headlines (title, link article) all that you get in old fashioned RSS 0.91, but yes, I guess one might need this down the road.
But c'mon, dude, I doubt your research: "the only one I know of that will let you fully customize CSS style"- your feed code is a pile of HTML tables and embedded CSS from the params sent to your server (colors, etc) and then spit back. Our implemetation does it the sensible way- the feed just returns the information in standard HTML with CSS classes, and all the customization is provided on your own CSS styles.
Maybe I am being picky, but as others have been at this longer then me, I would hesitate making claims of being "first", "only" and just sell your service, which works fine. based on what it does. Leave the loud claims for the plan jackets down at the used car dealers. Just a handful of others at this for more than a while: