Alot...i mean Alot of Vapors have complained about Burnt tastes and atty's burning out Quickly at 6v's....if you ask around...depending on Atomizer of choice 5v's is still the King(sweet Spot)when it comes to vaping
the chuck is a fun Mod...its great that you can custom design picture you want on it...but that novelty runs out quick...and thats really all it has going for it...It overbuilt to the point of being huge...with a strangely under designed button...and NO 5v option
The Silver bullet is well designed with a good quality switch.but if you want to use anything but a 510 Atomizer you have to fool around with clunky adapters that don't always fit 100%...with the nice shiney exterior you need to constantly wipe fingerprints and other smudges off it...And it Also Doesn't offer a 5v option
The GG is a Mechanical Device and has a huge following with other users willing to step in and help you out at anytime...But is Extremely Expensive, shipping takes forever, and if you have a problem you need to ship it Back to Greece(Sometimes at your own Expense) for repairs...there Have been problems in the past with random failures, that i believe have all been fixed...Again it doesn't offer a 5v option
The prodigy is a Great device and the guy that sells them, is a GREAT guy, from what i've seen he's VERY quick to offer ANY assistance at Anytime, they offer a 5v switch(With resistor) and a 3.7v or 6v Switch(Without Resistor)...But you need to Buy both which can get expensive....and switching between 3.7v and 5v is an ordeal involving switching batteries, switches etc....while the switch has a nice feel to it...there is some history of switches guming up and failing and i believe he is in the process of raising prices and changing to a new design
Just some food for thought....In the end if a mod offers the same Voltage as another mod the performance will be almost identical...it comes down to what you think looks the best and what you think will fit your hand and/or lifestyle the best