You will probably get better information from the forum Online Travel Booking and Bidding Agencies. This thread, MilesBuzz!, has a different purpose.

In the online forum mentioned above there are these threads that might assist you:
Has anyone used FareBuzz?
Has anyone ever used Farebuzz?

In the TravelBuzz forum you might try this thread:
Best Way To Get Best Business Class Fare?

You will find it difficult to search for information about skyclub.com. Delta's lounges are called SkyClubs. So using "skyclub" or "skyclub.com" as a search term will give you results pertaining to membership to these lounges and not about the subject of discounted biz class travel.