Pros
No pros at all. They use probation period (Probezeit) as a tool to renegotiate joining salaries. Never join this company if you are from Top consulting firms. They cant pay. The just entice people and then blackmail them.
Cons
Was hired with a certain salary and then at the last week of probation period, asked to take a 20% pay cut, without which they would fire me. When I objected, they stated that in a probation period they can do whatever they wished. Since I had relocated from halfway across the world, I couldnt just refuse. I had to accept downright discriminatory and one-sided terms because I was in a foreign country (Germany) and had a family to support. I had a great career and was wooed away with a high salary only to be cheated and blackmailed later. They needed me, hence, they didnt fire me in probation period. They just used it to renegotiate my salary at a time when I had no way to oppose it. Please avoid these frauds at all costs.