I had a good experience with Gigaset from a previous budget model (A120) that lasted for over 10 years. I changed it not because it didn't work, but because some buttons no longer worked. However, it still functioned properly as a phone and the screen was also without any issues. I managed to synchronize my old handset with the same base simultaneously, which means that with one charging base, I have both the new and old handset at the same time, so I don't need to transfer the phonebook to the new handset. Additionally, by using the int button, you can make calls from one phone to another.
I initially replaced the batteries with 800mAh ones because from previous experience with the previous model, the batteries that came with the box (400mAh) did not have a long discharge cycle or withstand many charging-discharging cycles. Also, when they lost capacity, the screen was not clear (the digits were dim) despite the brightness.
The only thing I would like to have more is illuminated buttons, not just the speakerphone button. 5 stars for the ability to have multiple and even older devices on the same base in such an affordable device.