Don't know why some users may be having problems. This BitTorrent client has been working fine for me on my 2006 MBPro-2,1 running 10.5.5, and using a high-speed cable modem (the connection may be the issue). Newer BitTorrents download much faster than older ones, and more popular TV shows (for example) may have more peers, but this is to be expected. This particular app seems to be updated more frequently than many other alternatives currently available, some of which seem to have been abandoned altogether.