Welcome to the Q&A Forum

Dupe-content-wise, you should be fine. iFrames just make me itchy these days, and I've never thought they were good for users, but it shouldn't be a disaster for SEO. The biggest problem is probably just that you're not really getting any SEO value - it's really just direct traffic via a referring site. Granted, it's better than nothing, and I know from painful experience that sometimes you have to take what you can get in these situations.