Pending results I might be able to give better insight, but I took the Hiner Seismic review and I found it to be excellent.
I agree with ptatohed that you should be able to pass with just self study. Having taken the Hiner course, I think if you just buy the workbook and go through it and do all the problems twice or 3 times (which takes a long time) you should be equipped to pass seismic
Survey I used Cuomo and Mansour's books and just did a bunch of practice problems from those books, 120 solved problems, sample survey exams, and reza - I finished Survey with 30 minutes to spare - who knows if I passed though =)
8 Hr, I self studied - my friends who took classes said it prepared them well for the AM but the PM was still challenging. I felt the same way about the test so...maybe the class wasn't worth it?
Everyone's different, you might get better responses after the results come out. Good luck to us all =D