The Open class at world level allows for changes of span during a competition. The EB 29 at the maximum allowed weight with its shortest of 3 available tips can match the wing max loading of the JS 1C for the strong days and with its longest tips will have a better climb rate and Max LD for the weak days. That's what the winner of the recent Open class wirlds did. Of the other open class gliders only the Quintus and Antares 23m can acheive similar max wing loading of the JS1c and the 23m tipped EB29. So if cost, ease of handling, and being restricted to one class are not deterrents then the EB29 is the one to go for.

The JS1 aerofoil seems to be extremely good. Under 18m class rules the ASG 29, with its smaller wing area, has a higher maximum wing loading than the JS1 and glides as well or marginally better at high speed. In the recent GP, with a defined maximum wing loading rather than weight, it looked to me that the JS1 EVOs had a definite edge over the 29s in the final glides.