Absolutely!! I couldn't live without it. I have too many teaks to list but to name a few; manual correct, swipshiftcarrot, winterboard, Ifile and so on
Was Jailbroke on iPhone 4. Ordered iPhone 5 and restored 4 to give to daughter. Will Jailbreak 5 when a new jailbreak is released because until Apple lets us do what Springtomize does and MultiClean at a MINIMUM...then I will continue Jailbreak 4-Ever!!!
-adblocker
-anyattach
-bridge
-fakeclockup
-fiveicondock
-ifile
-itransmission 2 (bittorrent)
-protube
-safari download manager
-sbsettings
-tetherme (enables native wifi hotspot)
-trygpsout5 (to send my gps signal to my touchpad for use with android's superior google maps)
-weeflashlight / weekillbackground
-zephyr
-zeppelin
-3g unrestrictor 5