I have tried nearly every name brand e-cigs on the market and altho only had a short while I can honestly say I have found the new vype e-pen to be the best I've used so far easy to use easy to change oils, the battery life seems by far the best also the oil (I'm using crisp mint) is good and has lasted me 2-3 days being a smoker of 20 a day and most of all the draw you get from the e-pen is more than satisfactory on the normal strength and also has the added bonus of the stronger strength button which other than just to test have not had to use as yet but Definitely gives a nice kick for people looking for stronger hit all in all I'm extremely happy with this product :)