The information on the connection speed is always meant as the theoretically maximum achievable speed. According to the information in the promotional film, however, it should be possible to achieve significantly higher connection rates via Powerline than "only" 100mBit. I recommend forwarding the question to the experts at Digitec.

So 100Mbit is not bad, as long as it is only used for surfing. If you need higher bandwidths, then you will have to pull a network cable.