Exactly. When I started with this hobby in France, there was a brand "Resun" which was making copies of Tunze and co. A friend of mine was a big advocate of them.... till his return pump burned and nuked his tank, along with a nice burn mark around the tank. Luckily he was home.I used that brand for years, they would always crap out within a year. I still used them until a few months ago when the power supply melted down and almost burned my house down. I went and purchased mp40s and apex wav.