I have "dual ISDN 128kbits/sec", and those values are pretty much perfect for half the torrents I download. The thing is, you do in fact get a higher download speed with a higher "connections" setting on torrents that have bad seed to peer ratios (more peers than seeds). For a while I was setting my Connections Per Torrent to either 30 or 60 depending on the torrent I was downloading (with Global Connections obviously set higher). But I got sick of changing it and right now I'm sticking with 45. All those connection settings are absolutely perfect for well seeded torrents without many peers. But I believe the current default speed guide settings are slightly nicer to your connection for the meaner torrents. I'm not sure if this applies to the broadband connections.