http://c6imawxshxailtv3vq5eupegagjafxtn2p7vn2aq6jgv5hf23ajqpdyd.onion/conspiracy/comments/5/n/0/y/o/i/cia_mkultra_is_on_the_verge_of_being_exposed_in.html
If you take those precautions, the main risk in using Tor in from traffic correlation attacks, which have relatively limited success in identifying users. At the very least, Tor is an improvement over just using the web in the clear, and unless you doing anything that would attract attention (e.g. frequently visiting known terrorist-involved websites, or organising some sort of smuggling operating), the level of anonymity it provides is still useful...