If you were a 0L interested in Litigation what kind of work would you do over a summer in this program? In applying, can you make it clear you're only interested in litigation? On the transactional side, what kind of work have previous interns done?
The answer to this will change based on what firm you go to, although you will have a decent amount of control over what kind of assignments you get. Generally speaking it's wise to take assignments from a wide variety of groups. I came in 100% litigation focused, but I've developed interest in M&A and bankruptcy as well.
Also, after seo, have people who've done the program been better prepared to do actual 2L associate jobs? In what ways? Do people manage to come back 1L and 2L year after their 0L summer?
Better prepared? No. Better able to know what you actually want to do and relay familiarity with the firms and what they actually do? Absolutely.
Coming back 1L is unlikely with most SEO firms as they simply don't take 1Ls. The few who do generally take a good number. I think most firms extend some sort of leg up to their own SEOs at OCI.
Has anyone heard of any negative experiences in Seo? Is there feedback during the program from supervisors? Who supervises, partners or associates (or even summers?)
Nothing negative about the general experience. The firms treat you incredibly well, but the people who run SEO can be very intense.
Feedback will vary by firm. My SEO firms didn't do reviews for us, but others did. Other than that, you are treated exactly like any other summer associate. You bill hours, get staffed on stuff, research, write, etc. Until class year comes up, you're indistinguishable from any rising 3L.