510 carts on a 901

[Madness]

I'm sure someone here has tried this but I figured I would post it anyway.

Just playing around, I put a 510 cart on a 901, the draw is easy and light, fit is a bit loose, but Vapes great.

The 510 Carts seem to hold more liquid and I do like to add the tip from a 801 on them

At this point I'm not sure what is better the 510 or a 901 with a 510 cart, I do know this much, my 901's are going to get more use now.

Now, to find something to make the 401's hold more liquid

[Christopher]

I'm not a 401 fan, but I do know the 510 cart fits nice on the 901. But why use the 901 over the 510?