Yes! - I don't see the 40x's mentioned very often of late, but they got me off analogs going on 19 months ago, and I still prefer them over the 510 (Ego) stuff.
I was a heavy smoker, 2 ppd, and the 401 did the job.
Got even better once I dicovered dipping.
I don't know why M401 is looked over.
I used 510 before and it wasn't for me.
I removed M401 bridge; improves dripping and you can clean coil w/ toothpick.
Does not help w/ the dipping though...lol.