What do you like best?
ViralSweep is very easy to use and integrates very well into mailing lists such as mail chimp, all the major social media venues and has great tools to display your giveaways on your own company site. Also like the customization it allows in the creation of each giveaway. It is a great value at it's price point.
What do you dislike?
Don't like the free version of ViralSweep, it is just a tease. You need at least the $50 a month version to make it worth your while. While it offers good customization it could offer some more benefits at the paid level such as a mobile app to monitor and edit your giveaways if you are away from your computer. So if you are a Bigger company it isn't so bad, but if you are a small company then your value for money spent is questionable.
Recommendations to others considering the product
My recommendation would be to analyze your needs and compare your options with the major players in this software arena. But if you go with ViralSweep you won't be disappointed.
What business problems are you solving with the product? What benefits have you realized?
The business problems we are solving where how to grow our less popular social media followings. The benefits we realized from this product are that it actually works. We are a small start up and when from a handful of twitter followers to over 500 in one month. From just one giveaway.