I would think that the IPod kit would only be worth it if it lets you control the ipod via the remote. With the HU in the glove box, controlling the ipod at the HU is harder than just going to the Ipod. My Aux input works perfectly for that. The only advantages I would see is if it can be run via the remote and if it charges the ipod it would be a small bonus, but I have a 12V adapter for that too if needed.
My glove box is full of keys, cell phones, watches, wallets extra plugs etc. and I almost never use the HU for control as that there is too much junk in the glove box.