My first model was a dse901 and I loved it!!! Then I started using 510's, and after a couple of months of vaping nothing but 510's, I got back to a couple of 901's attys that I had stored on my vaping box.

I don't like 901's anymore. I got used to the draw, vapor and throathit of a 510 atty, so now, everytime I try to vape from a 901 I get angry cause "I can get no satisfaction".

So the draw on a 901 is going to be harder after getting used to another model that has a light draw.