I love a 2-level dip into Psychic Warrior. +1.5BAB, decent hit die, psionic feats, couple more or less useful powers, and the ability to gain Psionic Focus and take 15 on a concentration check all certainly appeal.
The mantled Psychic Warrior is nice for spending longer in it, since you can grab Metamorphosis or Temporal Acceleration from the higher-level lists.
Long-lasting magic natural weapons are cool, excellent size-increasing power's cool, lack of power points is not so much, it can combine with tashalatora for a monk build I can actually understand how to play effectively... Psionic Lion's Charge gives you pounce as a potential feature, which is nice if you don't want to dip CC barbarian. Vigor + Empathic Transfer lets you heal if quite needed, and Vigor is a lovely buff; getting Expanded Knowledge: Share Pain is helpful. Deep Impact is one of those useful ways to make attacks as touch attacks, and they have access to it, and are the most melee-oriented psionic class to have it.
Psychic warriors have some very nice powers that are good to dip into with Expanded Knowledge, but they really benefit from dipping back as well, or grabbing a mantle. Their major and frustrating weakness is a lack of power points, which can be mitigated with crafting or remedied with an infinite-pp combo.
They really do gish right, for the most part, buffing and wading in. It's easy to run out of power points, but also not too hard to build where that doesn't matter quite so much.