I didn't get a chance to play to play 3.5 psionics, but the Dreamscarred Press classes/feats/races/etc.. options seem very high quality and certainly on-par with Paizo's material. The psychic warriors have to choose a "path" on level one that gives them some useful abilities, soulknifes get a kickass weapon (and good BAB at last!) Psions have Disciplines that emulate wizard's school powers and wildens get wild surge.
Now that Psyonics expanded is comming up, wich is somenting in the lines of the APG, you will get the same benefits that core got with the APG. Plus, the new classes seem interesting, the Aegis in particular (like a soulknife, but with armor).