Gift Upgrades allows your members to easily and quickly purchase upgrades for other members. It is tightly integrated with XenForo's core user upgrade features allowing seamless gifting of upgrades you have already created.
This add-on has been in use at Se7enSins.com since the beginning of the year and replaced a previous iteration. Since this was installed, upgrade purchases have increased by three folds. If you would like to demo this add-on, you may do so there.