The M201 IMO is a much better device than a M401.
Just received this 201 on Saturday 2/6. I have been using it pretty much non stop since then.
My first ecig was the Smoking Everywhere kit I bought at the mall 10/11/09, which like alot of people, I paid way to much for. I think it is a 4081. A couple days after it I ordered 401's from Intellicig.
In comparing these two devices there really is not that much of a difference in them other than the price.
I wanted to try a pen style and decided on the m201. When I first placed the pre-filled cart on the atty I thought this thing was not nearly as good as my 401. Hardly any taste/vapor or throat hit. I filled one of the blanks with some 24 mg RY4 and wow, what a difference! This thing knocked me outa my socks! The taste was awesome. I never had a throat hit or vapor like this with either of the minis I had.
The 201's I received have 4 little notches at the top edge of the threads on the atty and the batteries have two tiny holes on one side towards the bottom of the threads. The draw is equal or maybe just a very little harder than my 401. The battery life is superior. I can get maybe 1.5 hrs of vaping outa of the 401, the 201 lasts about 4 hours before needing a charge. The cart size is HUGE in comparison. This thing holds 1 ml!
I tried using blue foam for the wicking material and it seems to work good. So far I'm very impressed with this e cig. Going to order two more kits shortly.
Happy Vaping Y'all