Henry
Autoexreginated
LadyDM, if you are using the Expanded Psionics Handbook (whose rules are duplicated in the SRD on www.wizards.com), then a psion will integrate well into a party. The only things to watch out for are a few powers that have not been edited for mistakes, but a lot of DM's watch for. In particular, watch out for ANY Psionic Power that increases the saving throw by 1 for every additional power point spent (Energy missile is one example). Powers can scale upwards now, in the new rules, but a psion who blows all his power scaling things upwards can quickly run out of power.
Having just come out of an Eberron Campaign with two psionic characters in it, I can say that the rules work very well, and with those minor edits I did not have a problem with any of them. It's worth trying out to see if they fit your campaign (as I said, the rules are available online for free), and if on the off chance your player stumbles into an overpowering ability or combo, you can work with him or her to alter the character to fit.
Having just come out of an Eberron Campaign with two psionic characters in it, I can say that the rules work very well, and with those minor edits I did not have a problem with any of them. It's worth trying out to see if they fit your campaign (as I said, the rules are available online for free), and if on the off chance your player stumbles into an overpowering ability or combo, you can work with him or her to alter the character to fit.