This one goes by many names. It is called the Vision 3.5ml, The Vision Deux, The Vision Extreme, and it also comes in a 2.5ml size. Some include LED lights, those are just a gimmick, and they typically outlast the LED lights, as they last through many refills. I have had several for 2 months now, and they are running better than they did when they were brand new.
I see the one that DV sells is 3.0 Ohms. I don't know what you are using. Some might find that a little cool on a 3.7 volt PV, I use a KGO (which is an eGo clone), and I prefer the 2.0 - 2.4 range for warmth of vapor, the 1.7 Ohms get too hot, and I felt the 2.8 - 3.0 did put out a lot of vapor, but slightly cooler than the lower ohms. It has a simple 510 connection, so easy to screw on. It refills easily without syringes.
What is your PV or mod?
I think you will find the eGo to 510 adapter as easy to use as an extension cord in your house. All you do is buy this little screw sized adapter that DV sells, it's smaller than a dime, it screws into your 510 connector, and then the CE4 will screw right into that. I think the Vision 3.5ml are great, but the CE4 might be a little sturdier, holds less e-liquid (1.6ml instead of 2.5ml or 3.5ml), and there are fewer defective units with the CE4 than I have had with the Vision 3.5ml, although I continue to use both.
I think you should get the 510 to eGo adapter, and try both the CE4 and the Vision 3.5ml, or 2.5ml if you want the LED light as well, I don't think DV has the 2.5ml without the LED light, which I hear is kind of cool, the LED costs $1 more at DV, but it's a lot more at other vendors. I think you will find you will have purposes and uses for both the Vision 3.5ml and the CE4, they both have their pros and cons, mostly pros, I use them both exclusively now.
I am anxious to try the CE5+ re-buildable, very similar to the CE4+ but you can replace the insides when they go bad, and the 4.5 ml Vision with it's 4 wicks, and the CE6 Clearomizer without a coil but some other new heating mechanism. The E1 ReVive v2 Clearomizer looks interesting to me also. Vision just came out with a tank which comes with 3 atomizer coil heads that have their own wicks attached, each coil has it's own ohm rating from 1.8-2.4-2.8 ohms separately, that you can add to the tank at your convenience, but DV doesn't sell it yet, it looks totally cool, called a Vivi Nova.
The 510 battery to eGo adapter is here at this link to DV, it just involves screwing the small end into your 510 connection, and then you can screw your CE4+ on to the end pointing up. I think you might like the 2.1-2.4 ohm if you are using a 3.7 volt PV or mod.
Adapter - 510 Battery to eGo Cartomizer