Typically a wand's activator—not its creator—makes decisions about the spell cast from a wand (unless, of course, creator and activator are currently the same creature!). For example, despite the spell true strike saying Target: You, the wand's creator doesn't and can't designate himself as the sole beneficiary ever of the wand's effect. Although it would be kind of awesome to create a magic item that, when activated by anybody, gave the magic item's creator the benefits of the spell true strike, that's not how a wand of true strike works.
Instead, a wand of true strike can be employed by any creature that can activate the wand, whether that's because, for instance, the creature has the spell true strike on its spell list or the creature makes a successful Use Magic Device skill check to use a wand (DC 20). And when the wand's activated, the activator makes decisions about the spell, which, in the case of the spell true strike, is usually pretty easy since there aren't any decisions to make: the true strike spell targets you, and the spell's range is personal. (How the spell's effect is put to use—that is, Who do you attack?—is a totally separate decision, entirely different from deciding on the the spell's effect!)
The wand's activator is usually the only one who benefits from the wand's true strike spell because of the true strike spell's entry of Target: You; if another creature wants to benefit from the wand of true strike then that creature itself must activate the wand. (Note that, because a typical familiar has the special ability share spells, a wizard that activates a wand of true strike could opt to have the wand's true strike effect affect his familiar instead of the wizard himself. Also, because Pathfinder, numerous other exceptions exist.)