Awesome app - Awesome price!
Considering that I've been using the free istat widget & istat menus, giving a measly $2 for having this info in my hand at all times was such a no-brainer that I shouldn't even be spelling this correctly!
My only suggestions - and they're cosmetic, really - are to 1) be able to change the name of the device from "my ipod" to either the device name or something I choose, 2) to rearrange the order of the sections (as some are more important to me than others), and 3) have an icon of the device for Touch/iPhones instead of a generic disc icon.
So, in conclusion, this app rocks! (And freeing memory took about 3 seconds for me.)