On same track as u but Im back on 3.2.2.
Some (ALOT) cydia apps that came long before apple did put their own tag on It and made It worse are far superior then stuff ex mutlitasking etc.
And yes, new IOS versions have many "new" features but many of them has been out for the jailbreaked idevice a long time.
"Personal Hotspot" IOS 4.3bX wow ? something new ? hardly --> MyWi Is 1 ex of a still super great app. (Compare the juice drain between "Personal Hotspot" and MyWi)
The jailbreak It self, Is is dangerous ? hardly, It's the stuff that people with "not enough knowlage" for the purpose they are using It that drags the jailbreak topic down.
So, Is there any good reason to upgrade IOS version?
"Own your iDevice" - Jailbreak