absolutely. in fact M+ is ONE the main reasons i JB now. there is a 3 day trial and then 7.99 after that
currently, here are some other tweaks/apps i have installed if you want to check them out:
FullScreen for Safari
ScreenDimmer
ProTube
MyWi
My3G
PlayAwake
Ipsum
Lorem
NoNewsIsGoodNews
NO LSB
NowListening
PandoraSkip
(within Activator i use Volume up, short hold for Next Track & Volume down, short hold for Previous Track)