Listen me out
1. The default LG launcher is NOT the Android Launcher with a skin , It is a separate launcher LG made for those phones! It is what all phone makers do!
2. The corrupt files is POSSIBLE but doesn't happen to everyone , Possibly 1/200 people would get it from Zeam! (I saw a post on the internet with over 5000 people complaining it bricked their phone and they wan't a refund by MetroPCS) (Not all on the LG Connect , it can brick other androids)
3.The LG launcher will run in the background if you don't freeze it (needs root) if you do not want to root , Stay with LG since a another launcher will use Ram and 2 launchers using ram will make it slow! If you root , delete the LG and put Zeam if you want . I recommend rooting but I don't like doing it myself since I am not the best rooter and my computer is kind of weird with programs (Windows 8 Consumer Preview)
4. Launcher size in Manage Apps or on the Android market
5. It is smaller so it uses less Ram the stock but you need to freeze/delete stock if you have root then use your desired launcher to run fast!
6.It will only increase battery life if , You don't put tons of icons on your home screen and widgets (Widgets update usually and waste battery and run in your Ram!) So I recommend choosing one screen and fill it with what you want , and Delete the rest (Or be a widget/Ram hog!) (I personally only use 3 screens instead of 7)
7. Zeam is user made so put it on internal memory , since it will load with the phone on start up , if on SD card , you must wait until it scans your SD card and gets it fully ready then it launches it so your stuck with a black screen until its done when you turn it on (if its on SD card , so put on internal better
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8. This is your choice , Not mine , so do what you want , but remember , You might be one of the angry dudes that gets the phone bricked , or waste battery , or whatever , I just want to help and tell the truth around here