I downloaded and tried the trace tool but was not that impressed. I send off about 4-5 jobs a week to a vector service, so I thought I'd try some recent ones, if I could do it myself then the sw would be worth it.
The only thing it did well with was a black and white line drawing of an animal, but the logos I tried were mediocre. Fonts and curves were bad with bumpy edges. And the original was like 400x800 pixels, not bad art at all. Probably would be fine for stuff that's biz card sized, but not good enough to blow up and cut.
I still don't think automated software can do as well as what a person can do by hand, sux but that's a fact.