BitTorrent: who has used it frequently and for what?

I would like to know more about the current use of BitTorrent. Questions that I have are:

  • How frequently you use it (per year)?
  • Have been it use declined or increased during the years?
  • Do you find it cumbersome? What are the usual main problems?
  • For what do you use it mostly?
  • Do you use it to download / upload data for analysis?

Hope to hear from some of you!