That doesn't make it bad moonless. It's just good to know what it is so you can know your options.
Some eGo style units are sold as 4.0 volt (I think they follow battery voltage... 4.2 volts being a fresh charge of a typical 3.7 volt battery). Some are modulated to 3.7 some to 3.4 (the eGo stuff). They are all good tho... it's just good to know so you can play with the options.
Then there's the one that six linked to above... uses two swappable/replaceable batteries stacked and regulates it to 5 volts... like my DIY 5v boxmods do, only it's a tube mod.
Anyway. I hope you enjoy that new mod and vape the heck out of it. I'll bet only 50% of the mods on the market rock the DCs. With higher voltage, you don't NEED DCs anyway. And even at 3.7 volts... 2.0 ohm is usually plenty for an atty/carto. 1.5 - 1.7 ohms is pretty hot.
Besides, I would never want to disappoint Capt. James T. Kirk
Use it and rock it! Try different options. I was only answering the DC comment. I hope I didn't put you off your new mod!