Just wanted to add my Echo build.
Spent about 1200km on it now and love the feel of the bike.
Its built with Ltwoo Erx, Shimano Dura-ace chain, ultegra cassette and the wheels are a mix of Sernenade wavy rims and goldix hubs. Then i use the magene teo 170mm crankset with powermeter.
After some hurdles with the buildup it has been really smooth.
Upgrades to come are 20mm longer stem to change my position a little bit and the wheels will be changed to a set of Zen wheels. Just should decied of what.