I am going to assume you're talking about MVS's Mvari-stick.
This is a fine
device, I own one from another vendor also know as a version 1 Lavatube.
The thing is, there is a newer version with a few upgrades, more total power output capabilities, a streamlined body, a battery life indicator, and a meter to measure the resistance (in ohms) of your atomizer or cartomizer. This upgrade is available many places for roughly the same price as the unit you are looking at.
I have been happy with my version one since January, but I use it only occasionally these days due to a few other toys I picked up this last month.
I would suggest trying the eGo twist, as I have heard many glowing
reviews from reputable vapers with more experience than me. However, if you are looking to get in to a type that takes
batteries and isn't a battery in one unit, do some research on here in the APV section (advanced personal vaporizers). There is a lot of amazing information in there, and many funny arguments. I can't emphasize the importance of looking past opinions to the information that is important to you and what you want.
Please note I am not pushing any one product or another, but as a 2 year vaper I remember starting out and buying a few things that just didn't do what I wanted or expected because I didn't do the work first. Do the research and it will pay off!