Reliabilty and high-quality work are always going to be the determining factors in your success, not the certification, but it does look good in the signature line of an email. Yesterday I emailed a scheduler directly to ask for a high-paying job, and got it. I've only done one other job for this MSC before, so even though it was a 10, I haven't built up a solid relationship with them. Maybe the "Gold-certified MSPA member" line under my name helped; I don't know. I agree with Michael C in that if it does get you one job that you wouldn't have landed otherwise, it's worth it--but I think it's GOOD advice to sign up with as many MSCs as possible.
To answer your question, OP, I think you'll be fine. The test was harder than I thought it would be, because I was expecting a cakewalk, but it doesn't have any really obscure questions. I passed it on the first try and they don't tell you your grade. As was pointed out earlier, though, it's not a question of whether or not to get the DVD course because the DVDs ARE the course.
"The future ain't what it used to be." --Yogi Berra