I'm new to this and have only had my 501 for 4 days. I have nothing to compare it to but I find the strong throat hit disappears after about six puffs. If I top it off I can get a few more. I am not sure if it is the juice or the 501. Either way, I have gone from 2 packs of analogs per day to 2 cigarettes. Amazing
You can't puff at the same frequency as an analog. The fluid needs time to wick into the atty. Slowing down worked for me.