BUY IT! Different voltage = difference flavour, and was the singular reason why I ordered this battery. My favourite light liquids are Cignot's Wenston VG 6mg. and T blend 16mg. They REALLY replicate tobacco brands I once smoked (guess which, lol). But I'd use the small 510 battery for flavour retention- and we know one must have several 510's ready as they need frequent recharging. When working long stressful hours at my home office and no time for fooling around, I'd sacrifice flavour for the convenience of longer-lasting eGo. THIS adjustable voltage battery SOLVES ALL DILEMMAS! Now, full flavour AND vapour are there for hours at lower settings. (I use Cignot cartos and clearos.) I couldn't wait to write this endorsement. But I conclude with an important caveat: I tried a friend's knock-off "Joye" twist and it was garbage; crappy vapor production on the lower setting. Accept no substitutions. Spend the $, get the REAL brand HERE. Cignot=product selection and total integrity.
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2 of 2 people found the following review helpful:
eGo C Twist
December 30, 2012
Reviewer:
Tammy
from United States
Great product! As you know, liquids taste different at different voltages, and this product fulfills that need quite nicely. You can dial in the perfect taste for each liquid, and have several different tastes per liquid. The only drawback that I can find is the numbers at the bottom of the twist are very hard to see; however, this is not a great concern since it really doesn't matter what the voltage is as long as you are happy with how the liquid tastes.
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0 of 2 people found the following review helpful:
had better
November 29, 2012
Reviewer:
Robert R Aggen
from Nashville, TN United States
Love cignot hate these batteries , first one button broke in 2 week, second one quit working in about 3 weeks. also bought an upgrade battery with just 2 settings and it lasted a fair amount longer. not worth it in my opinion because of this experience i switched to 18650 batteries and will prob never go back.
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1 of 1 people found the following review helpful:
Upgraded from a Joye 510 to this and its wonderful
August 23, 2012
Reviewer:
Mike
from VA United States
This battery is amazing, dial in the voltage and bam clouds of vapor from my bogue 510 cartomizers, and the flavour I'm getting its like I'm tasting my juices for the first time all over again.
The only downside is that it takes 3 hours to charge with the USB charger, so I ordered a second twist at 650mah to use when my 1000mah is charging.
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0 of 0 people found the following review helpful:
Works Well
June 14, 2012
Reviewer:
Garrett
from Texas
The eGo-C Twist works very well and the voltage is almost spot on to the markings on the end cap. It is pretty long especially when using eGo-C tank but it still fits in pants pocket. Recommended!
Genius Product Solves Problems 
had better