It's different because there are not the usual separate Arrival and
Start time controls that you are used to. There's only a, well, let's call it something else, a "GO! control". So you check in just before
your minute, are released on
your minute, and are scored from :00 on that minute till you're clocked at the finish.
Yep, it's different.
It works, with the large amount of space and 30 minute check in window.
Now someone needs to pipe in and say "that's not REAL rally". *smirk*