Freezes noticeably colder than similar products I've used, one costing 3x the price. It's also frozen deeper. That said neither this product, nor LNG applied by my local clinic, removed a small foot verruca that I've had for 10 years.
The product ceased working after being used twice. I don't know if it froze up - no pun intended - or the gas simply ran out.
But this product I found better than the competition. It didn't remove my verruca but as it reduced it, I would buy again.
Update: 4 sessions of the new SWIFT microwave treatment have been successful in removing my long term problem.
Have bought two of these applicators and both broke within 2 days of using. I got just a couple of uses from them before applicator jammed and became useless. Would definitely NOT buy again