Hi Davide,
MistressNomad is absolutely right, it improves everything except the taste of some flavors. I love vaping at 5 volts.
I you are interested in trying a 5 volt device, there are some fairly inexpensive mods available. I bought one from Ken's Box Mod just to try it and I'm hooked.
If you do decide to go to a higher voltage, you may want to consider a PV that is adjustable like the Buzz, Little Sister, etc..