I have both from litecig. Personally I like the M201 the best.I was a heavy smoker and the 401 proved to be to much work. Cart refilling required removal of the inner cart,etc.Vapor/flavor were good though.Also needed 3 batterys to make it
thru a day of work.
M201 is larger,battery lasts about twice as long,plus the 201 smokes very close to an analog.Take too big of a hit w/ high nic
juice and you will cough.
1 cart will last me the work day,another for the night.I go
thru 2 batts in a day.
The 201 is about the length of a pen,401 like a 100..
I have used the e-cigars,some off brand junk,m401 and finally the M201 which I will stay with.Very Pleased

