I think most people don't clean them properly. My threads are just fine on the Goblin. The Goliath works great if wicked right. Lot's of user error with tanks I've read. Youde has nailed subohm tanks. No reason for me to use anything else. Loving the rifling chambers and drip tips from them.I've only owned two UD attys. The aga t5 and t7. Both are beautifully machined. However, several people reported bad machining on their Goblins so I never bought one. And wasn't the first Goliath a bomb?