If you look through the thread here you will see feedback from the campaigns that were executed, for example the last person to give feedback was here
https://bitcointalk.org/index.php?topic=1181659.msg12533339#msg12533339You can feel free to contact the person via pm for a more direct interaction with a Viral Sponsor Experience since many sponsors in the past until now choose to remain low key about their promotional efforts for such services/products on public forums.
The buyers in here are all clearly shown by their own posting to confirm what packages they have paid for.
Hope this helps.
When i launch my service next month (If all goes well), you better believe i'll be using VIRAL network to blast the promo ANN to over 300k cryptoheads in a single shot. Glad I was 3rd to pick up my package.