I have the first DX-Master Pro + in the USA for a few months now and it's amazing. HD build quality with lots of head room. I can run QRO 1500W SSB QSO for hours and never goes over 45c! Very quiet low speed cooling and powerful hi-speed cooling. It's All About Headroom :) As far as I can see from the way the amplifier is designed and built if used properly this amp will last a lifetime! VK-Amps and Onder are for those who want the best!