Meanwhile, I went the Pamperei with the shaving cream on the nerve and I looked again an electric shaver at a reasonable price. Decided I have myself then for the PT920 and so far no regrets. The thing is phenomenal quiet, extremely fast and very gentle on the skin. In my Tracer skin was always irritated and it took quite a long time because of the always two shaving heads, until the result was satisfactory.
I'm a fan of simple products. I need neither a razor which is styled spacey, even a cleaning station caused the additional costs, but would like to see excellent shaving heads and Li-Ion battery. If you add it all together, you will eventually end up at the PT920 / 18th centuries.
The only (small) criticism of the remains is the thoroughness compared to wet shaving. But that is technology-related (because there is no contact between the skin and blade) and makes almost any other electric shaver better.