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The bit of reviews I've read (dig through this forum for some of them) basically say that for the cost (six months, I believe for whatever price you pay) it's just not worth it.
Add to that the claims (which people have debunked, even AV said the sales person got out of hand) that their XML program gives a boost in ranking, it might not make any sense to give them money *unless you're looking at their XML based CPC program*.
Of course, experiences may vary...but personally the regular submit seems to do well for me. I haven't paid them a dime, and I don't plan on paying.
And then started getting referrals in less than a week after site launch.
Their db refresh rate has been pretty amazing on some stuff, far better than I've seen in a while...hope that helps!