I typically don't buy more than 1 of the same tank, but I loved the iJoy Captain X3 so much I had to have 2.
Like the T-Priv box mod, I've been using these tanks for about 2 years at this point, and haven't done too much searching for others. They've performed beautifully for me.
The best part about this tank IMO has been the coils. I've stuck with the single 'stock' coil. The coils are nice and thick, and they provide a ton of airflow. Great flavor from them, and they'll absolutely chuck clouds. Easy enough to swap in and out, and haven't really had any leaking problems.
Nice size bubble glass, great widebore 810 drip tip, easy to slide open top for refill.... these tanks have served me well. You can find em pretty cheap on some sites at this point, they're worth snagging if you can find them!