I am not a firm believer in high end amps but I do believe in quality and power.
So I chose Genesis as I saw a lot of 20 year old genesis amps still for sale in working condition. I figured it would be nice to try a second hand ~3 year old for not much money. Here in Europe they are priced quite fair/cheap second hand. It worked so well I decided to get another.
I think it is a sheer power difference but they did sound better than the JBL they replaced. I had one serviced (by their designer Gordon the Amp Doctor) and was still under half of their new price and expect to be able to use it for many more years.

It's not german but it is highly regarded over there (lol).