The mod is great, but since it is sold as a kit it is practically unusable due to the failings of the tank.
The mod itself works very well. It has a massive range of settings, allowing you to use pretty much any tanks and coils you want with it within the range of its power and resistance. I am now using it with the Aspire Revo tank and ARC coil and I would not change a thing with that combination. The mod is really easy to use unless you want to do something complicated, and instructions for the more complex functions are available to download in pdf from the Vaporesso website.
The tank is another story altogether. It's horribly designed. I had both the original tank I purchased and a replacement tank leak through the coil and into the airflow everytime it was filled more than halfway. The seals were all changed on both tanks, the glass was even changed on one (even though it wasn't leaking through the glass. A quick perusal of the reviews across the internet have many reports of this issue with these tanks. Juice leaks from where the coil connects and into the airflow.
Other than this, it's a little annoying that it comes with a GT CCell2 replacement coil for the GT Mesh coil preinstalled. This is just a money grab by throwing a cheaper replacement coil in the package, and will be unsatisfying to anyone who got used to vaping off the GT Mesh coil.
I would recommend the mod to anyone, it's a really neat mod with plenty of features to expand upon, but if you can, get the mod without the tank and get yourself an Aspire Revvo tank to go with it (they match up perfectly).