The Provari is an excellent choice for a variable voltage mod if you can afford the initial outlay of cash. Something to consider when deciding about whether to go with the Provari is, what are your expectations for a
device's overall life expectancy?
The less expensive Chinese-made PV's will have a limited warranty, most are not as well manufactured as a Provari, and once they stop working after the warranty what are you going to do? The Chinese manufacturers do not do repairs on their PV's so you are forced to buy again.
Buying a Provari ensures a long term relationship with Provape, the manufacturer. Known for excellent and fast customer service, Provape gives you a one year warranty (and offers an additional 1 year option at time of purchase if you want it). Even after the warranty expires, Provape will continue to service/repair a Provari for already posted fees-for-service. No Chinese manufacturer offers that.
A Provari has been a standard of durability, build quality, and consistancy for over two years. There are thousands of happy users that enthusiastically claim it is worth the money to own one.