As Altema mentioned, the stock Rad display upgrade will not give you any added power/torque so for $100 it's not really worth the price. When it's 50% off like it currently is.. it's a bit harder to say if I feel that it's worth it.
In the US, the display only lets you "unlock" from 32kph to a top speed of around 40kph, but I haven't heard if the EU version will let you unlock from the 25kph limit up to 40kph or what it tops at. Anyone know for sure?
Personally, I'd wait for the Eggrider to come back in stock or do the full display/35amp upgrade (but that would be a big jump in price). All versions of the eggrider were out of stock for quite a while but the Bafang version is now showing that it's available, so maybe the other units will be back soon too? Here's hoping. 🤞