I recently bought an Aspire BDC tank and I have to tell you that I love it. No leaks, gets good vapor, not too bulky that I can keep it in my pants pocket even with a longer 510 battery. The coils also seem to last longer in my opinion. My biggest problem with a lot of the tanks was the leaking form the bottom or accidentally sipping the juice, yuck.
I went through a lot of them and I am happy with the Aspire. Just one man's opnion