Edit: OK for Kmeaw for the above bold. the other is for Wanna(something) CFW don't install that. The other is for something that is usefull if you have an external drive that has other things on it other then games.
You can install the 2 but leave the other alone.
BDROM-Reset Example: Say you have an external game loaded in multiMan. You then decide to exit that game and wanna watch a movie you have on there. With out the BDROM-Reset the only way to make the external drive useful again is to restart your PS3. With that(BDROM-Reset) you just click it and it unmounts the Game that multiMan mounted and makes the external drive useful again.. Get it?