I've yet to really dive into the Glamour system in FFXIV, but I *LOVED* transmogging items in World of Warcraft, and FFXIV's items absolutely put WoW to shame!

However, like WoW, you're forced to actually keep an item on-hand in order to use it for Glamour, which can be problematic when it comes to holding onto tons of items "just in case" you might want to use its appearance, or even worse, when it comes to unique-looking items.

As well, with the Relic/Artifact gear, sometimes you might want one particular version, rather than the most powerful form of that item.

I don't know if anyone has ever played Guild Wars 2, but I *LOVED* their Wardrobe-system. Basically, once an item is soulbound to you, you "unlock" its appearance for your entire account. Even for items that share appearance, you only have to unlock one of them, and you'll be able to rock its appearance any time you want, no need to hold onto the specific item.

Maybe that's just me, though?