I have two drop bar bikes with Ekar 9X42 cassettes on them. One is a road bike rolling on 700X28 tires and it has a 38 tooth in front. The other is more of a gravel bike, rolls on 700X38 tires and it has an other than Campagnolo 36 tooth in front.

Top pedaling speed for the road bike is around 35/40 MPH. I can't push hard enough to make the other one go past 30.

Ekar is a bit on the fiddly side, but seems to be nice once it is setup correctly. I do not have any plans to change either of them to something else. If I build another drop bar bike it will have an Ekar group set.