Functional Differences between Lubuntu 12.04 and Ubuntu 12.04

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http://askubuntu.com – I understand that Lubuntu utilizes LXDE over Ubuntu's Unity(Gnome?); But being new to Linux I'm not sure if that change is going to be simply cosmetic, or if there will be functional differences I need to be aware of. The Ubuntu wiki says no, but it is also seems to be a very superficial discussion. I am comfortable(ish) with the command line and I suppose my question is more directed in that direction, but any information would be great. (HowTos)