The new Ultegra RX derailleur comes in mechanical RD-RX800-GS and Di2 RD-RX805-GS models. Both use the company’s Shadow technology and have the same low-profile appearance as the R8000 and R8050 ...
Shimano Dura-Ace has been on the market for two years and in that time Shimano has been through some tough times. Knowing that, it's easy to focus on the mistakes but there's no reason to do so.