I have used it a couple times now. I finally took the plunge and signed up for the upgrade. It really pulls in a lot of people signing up for newsletters, facebook, twitter, and gets the word about what you're promoting. I'd say it adds a "zing" to what you're doing. I have a giveaway for a $25 Amazon Gift Card for my blog tour right now, and it's up to 995 entries in a week.
I think how many entries you put in for each option is important. I put +10 for my newsletter last giveaway. This giveaway it's at five. I think I'll up it to +10 again for the next giveaway. I got 60 new additions to my newsletter with one giveaway. That is proving a fabulous option. Plus, friending on Goodreads and adding to read shelf was a great push. If you get creative, it can really help build your social media and fan base.
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