Not a breakthrough in that they are the same as Signia Pure Charge&Go IX.
However, the Signia IX technology was in some ways a breakthrough, and Horizon IX has that same technology.
IX technology was the first to offer multi-voice streaming so that different speakers in the same conversation could be processed separately. The IX technology also processes background noise separately from any speakers in a conversation regardless of whether it is a one-to-one conversation or with multiple speakers. All of the separately processed sound is then recombined so that you hear both speaker(s) and background noise but with greater speech clarity. Finally, IX technology processes your own voice separately to provide a more natural sound especially for those wearing closed domes. Signia is the only hearing aids with separate Own Voice Processing. It all works really well to provide a natural sound with clarity of speech even in background noise.