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Don't need to have a machine running to download.
Pro Popular torrents are instantly available
Due to server side caching popular torrents can be downloaded quickly.
Pro Can automatically start downloading content once it's available
Broadcatching is a method of automatically downloading content as soon as it's available. Broadcatching in BitTorrent clients is usually implemented via RSS.
Con Not free
Plans start at $9.99/mo.
Con Unknown underlying technology
It is unclear what BitTorrent protocol features or extensions are supported by the service.