I was in the market for a larger tank with my new Istick 30 and so many people were recommending the Aspire nautilus as an upgrade. I like to switch out juice during the day so I was having a hard time pulling the trigger on the Nautilus. I stumbled on this thread and thank goodness. I ordered two of the GS Air M today. I'm still new to all this so the feedback here was really helpful. Thanks ya'll.