XRay's updates are usually a lot of little changes that add up to a big change. This time they're making a big change (toe blocks) and probably the same number of little changes as ever. Not sure what that will mean on the track, but they usually tend to make the car better with each iteration, and the T4 is already spectacular on the rug. I think it's a very exciting time for XRay drivers who are planning to get the next kit.