I've had a problem with one mp10 out of 4 that I have with the magnet not holding the wet side in place, but none of my 4 mp40's have ever had issues.
However, my luck with Jebao is not so good, as I tried the cheap route, and the 2 I had broke within 12 months.
However, my luck with Jebao is not so good, as I tried the cheap route, and the 2 I had broke within 12 months.