The xhaler is the one I use the most. It has a perfect hit, for one. The attys get hot fast but is much much better with those 901's that have the solid plate surrounding the wick. The best thing about it is the atty connection will never fail. It's made out of brass. The switch is a real solid piece made of brass that looks simple enough to fix or replace if it should fail, which I doubt. It will probably last alot longer than the other e-cigs because it is built simply using solid parts.