Decided to give them a try since SI was out of stock on T3 heads. Using them on my Volt batteries with no issues. Gotta say I'm pretty impressed. Nice flavor and plumes of vapor. They even gave Tribeca a completely new flavor. Only downside is one of the heads that came in one of the tanks was DOA. Halo is getting me out a new one. If the heads have a decent life I think I'm gonna keep these around for my Tribeca and ECBlend RY7 since they are my top used liquids and use the T3 minis for my other flavors.