I was looking at picking up the Aspire Nautilus adjustable airflow tank tomorrow and wanted to know some thoughts on this. How often would I have to replace the tank or any of the pieces? I am new to vape and use it very lightly, but the juice I use is a little thick. Anybody ever have any issues with these? The other is the iClear 30s, but not sure how sturdy/easy to break/crack either of them are since I travel by train and bus daily. I am leaning toward the Nautilus. Any thoughts or advice for a new guy?