Impressive! I've used it on a stubborn brake system and it worked great. I smelled heat and bam it was scorching hot. The brake line came out immediately. What also shocked me was how cool it was after a few minutes. I figured I should let it cool for an hour before putting it back in its case. Not so, it felt cool in about the same time it took to heat up. It may be made in China, but it was worth it.