Well, it all depends.
The twist will up the voltage on any atty that you have,
It works by you turning the base, to a desires voltage.
It goes from 3.3 (i think but not entirely sure) to around 5 volts.
When ego-c attys are nearing the end of their life, as in they cannot
keep you satisfied any longer, you could turn up the voltage to get a
little more out of them.
Also some liquids taste better at higher voltages, and some at lower
voltages, but you wont know your 'sweet spot' for a liquid until you try it
I notice that you have a DCT, this couldnt really be used above 4.1v
as it is a low res carto (of 1.5ohms) but you could turn it up to 4v, and
you will notice a difference.
Again, its all about finding out what you like and what you don't. For a
peep into the world of VV the twist is a great first step to take