i do see this under the question and answer though
Q: Is V-Mod fully 510 compatible — can users interchange their own 510 system (Cartomizer or Atomizer/Cartridge) instead of our proprietary cone/silo design?
A: The VMOD has a 510 thread which means that any 510 will fit it. Although, only our Silo is compatible for use with the feed system. The VMOD can be used as a battery only, and as a drip base system with the others. We do encourage modders to be creative to mod their favorite cart/carto to work with the VMOD. Although, we feel our cartomizer is as good or better than anything on the market.
The reason we have a special cartomizer is our unique "tubeless" feed system. This eliminates a few problems with tube models, namely the mess. The design also incorporates a "juice chamber" that holds the juice right at the cartomizers feed ports to give longer times between pumping. It is also sealed so there is no leaking to the +/- contacts, and to the outside world.
Our cartomizer comes stock with a 2.0 ohms coil, a 1.7 ohms coil for the hardcore vapor will be available soon. These are considered "LR" or low resistance.
Another feature that no one offers that the Silo has is an interchangeable venturi valve. You can change the bottom port to draw hard or soft, to suite the users desire. We will offer 2 venturis (coming soon)
the vmod is another option to look at. It is made by Vapage and it is under $100, small, and has a lifetime warranty. I recently bought one and it is better than the other mods I have tried.