I've got the Masters Bundle with the LinEQ, multiband and L2, all of which are in your Platinum bundle also. They're indispensable to me, and I use one or all on most things I do.
The things they do best for me:
The LinEQ's low freq filter does something really nice to the sound just by being turned on, whether boosting or cutting, and whether in bell or shelf mode. I never use more than 2-3 dB change. The bell filters in the upper part of the EQ can be really useful for notch use but I don't like their sound much otherwise. The high shelves (two types) both can sound good when cutting.
The Lin multiband is fantastic for taming overly active dynamics in the low end and low mids. I use it very gently and to my ear it works without doing anything bad to the sound. Setting the crossover points is everything though.
The L2 is kind of failsafe. As long as I don't ask it to do more than 2-3 dB of gain reduction, it also doesn't do anything bad to the sound, just controls the level.
Tim