Dreamscarred really hit it out of the park with Ultimate Psionics. Aside from some occasional failures of the art to fully capture the essence of the material Ultimate Psionics was pretty much everything you could want form a self contained Psionics book. The material is clear easy to read and includes a fair number races, classes, powers, feats, items, options and rules information.
Ultimate Psionics not only very effectively updates virtually all the 3.5 psionics to pathfinder and matches it in volume with all new content. As with the original D&D psionics much of it is hit and miss since psionics covers a very wide range of ideas and has never been as well defined as the more traditional fantasy inspired classes, but the misses are a lot fewer than in previous editions and the hits are darn near perfect much of the time. The only things notably absent are D&D specific copyrighted material such as the Zerth Cenobite and a bestiary but with over 400 pages of solid, well written content they are hardly missed.
Ultimate Psionics truly lives up to it name and gives you tons and tons of content written by people with a clear passion for this often over looked and part of fantasy gaming.
[5 of 5 Stars!]