I use magic lantern on my 60D, so i don't know how similar it is but my favourite features are:
1.Analog Gain control. If you have an external mic, this feature is sweet, because you can adjust the dB of the incoming sound. With an external mic, you can only eaither choose -10, 0 , 20, nothing in between, but with the AG feature, you can put 20, and set the AG to say 12, so it won't sound like your in a hurricane when your on 20dB while following someone, or in light wind.
2. Audio meters. Very useful when you can here the output of your video on the internal speaker. Basically lets you know if you sound settings are set to to high of audio intake.
3.Focus Peak. Very Very useful if you don't have something like a z-finder, lets you basically show whats really in focus by showing colorful dots, Red means complete focus.
4. Time Indicator. lets you know how much shooting time you have left.
5. Magic Zoom. Small box that magnifies the image and you can change what happens when the video goes into complete focus, pretty useful!
hope this helps
"JJs provide all the stability of a pubescent bi-polar 14 year old going through meth withdrawals while his parents get divorced and going through a break up with his girlfriend because she is banging his 10 year old bro." - cobra_commander