It is more stable and faster than wm 5.0 and there is a ton of software that you can use with it.

its an open software too. you can contact nokia and purchase software to create you own symbian apps. like call interupt which will disturb a call when your talkin to some one who is gettin on your nerves. or call blacklist wich is s list of number you want sent straight to voicemail. its waaaayyyy cool.

i think www.mysymbian.com or www.symbian.com can really inform you about it.