although there are many people talking shit about ipt and it's owner, i still think it's the best general tracker. huge amount of content, very high speeds etc...
i found almost everything that i wanted there, from 480p tv series packs to sci fi audiobooks, they really have almost everything well seeded. i never had problems there, and know people that have been using it for years also without any problems.
also it is very easy to maintain ratio, there is bonus system, and huge amount of torrents are freeleech.