I got the PCBs from @oshpark for my breakout board for the RTC chip:
With some solder paste and my heatgun I managed to solder the QFN IC and the other two parts:
A quick test with my STM32 discovery board, generating some SPI signals shows that it is ticking, when I read the seconds register:
Note the jump from 0x19 to 0x20. This is because it counts in BCD mode.