I like the DSE901 atomizers. The standard (180mah) batteries supplied with a DSE901 Starter Kit don't last very long. This is easily rectified by:
1. Upgrading to the Mega-Batteries
2. Purchasing a Screwdriver (Uses the DSE901 Atomizer but has a Long Lasting Battery)
3. Buying a USB Passthrough
4. Designing a Mod of Your Own
I'm not trying to hijack anything here but just to prove that a 901 can do as good or better than a 510 as far as vapor production, build one of these box mods.
http://www.e-cigarette-forum.com/forum/battery-mods/106016-how-build-puck.html
It's cheap (< 10 bucks), the batteries last me 24 hours (sometimes more, sometimes a bit less). Batteries can be bought in any grocery or department store (rechargable AAA nimhs). You can get enough vapor out of this to choke you if you like.
I have built many for my friends and they will agree, I'm not blowing smoke here. With this battery mod, you will kick yourself for not trying it sooner. You will love your 901 atomizer and the 510 cannot even compare to the amount of vapor and flavor. I know, I have 510s also.
I've been trying to tell people about this for a long time. Some listen, some don't believe it. Some want to modify it which defeats the purpose. This configuration of the 4.8 volts and the 901 are the perfect fit and match.
It runs about 4.8 volts max and with a 901 atomizer running 3 to 3.2 ohms, your hitting 7 watts which is perfect for vapor production and flavor. Over 7 watts and you get hot vapor, less flavor.
Don't knock this until you build yourself one and try it. I use nothing else since I came up with it and you will see why if you build yourself one. Do not substitute a 510 into the design. It doesn't work as well due to the resistance of the 510 atomizer. If you use a 901, it will do exactly as I say.
I gave you a full tutorial with step by step photos so you can build one yourself. Give it a try and you will be a believer in the 901 atomizer.
I wouldn't be pushing this if I didn't like it so well.
Seriously!
http://www.e-cigarette-forum.com/forum/battery-mods/105465-now-puck-cheap-parts-easy.html