The biggest difference we notice right now is the actual size of his external processor. The 5 is SO MUCH smaller than the Freedom and fits much more flush up against his ear. It is also a bit of a sleeker design. I've been describing it to my girlfriends as a bit "iPod looking". I can't believe how incredibly light it is compared to the Freedom!
One of the coolest features that we're learning about is the 5's remote control. It looks like an iPod shuffle, but has the capability to pretty much manage anything and everything with Christian's CI. The 5 gives the user much more control over their CI than ever before. We were able to adjust everything from alert lights and sounds. I have to admit, the remote is most likely staying at home most days...it's one more thing for me to lose in my ever changing handbag rotation!