As per Psion:
Power Points: You start with 2 power points. You gain 2 additional power points at 3rd and 7th level, 1 additional power point at 13th level, and 2 additional power points at 17th, 21st, 23rd, and 27th level. If you gain power points from another source (such as your paragon path), add them to your power point total. You can use your power points to augment any augmentable power you have, regardless of how you gained the power.
This item adds (very briefly) to your power-point total, rather than the pool. Giving you 7 out of 7 power points. Furthermore, as the player can derive no real advantage from this beyond the free power point from the weapon, there are no balance issues to consider.