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Without a lot of very rigourous questions and clearly defined parameters as to where the links are coming from, age of site, placement on page, topic of page and site, and so on, what you're getting is a load of low quality links. That may give you a temporary boost, but could maybe hurt your rankings in the longer term.
If you're going to buy your links,buy them one at a time.
In fact, I would try to avoid even the sites that have free placements, but offer you "improved" placement for $$$. Google can't necessarily tell which are paid and which are free, and won't easily find the free ones anyway - so the directory is probably completely useless for link building.
1. Generally automated, meaning the websites you are getting links from are part of a predefined network or group, who often openly link between each other and to many other websites, lowering the value of the link you get.
2. Less control on link build rate
3. Less control over the actual sites that link over to you.