I have 2 auto loans and their Platinum VISA that have been reporting only to EQ and TU for the past couple of years. I just got an EX notification and it has arrived on that report now, too! It was a 20pt increase on my score, but I am guessing it is because EX was always a little lower than the other two without the mix of any auto loans or a bank card with this high of a CL. Just an FYI, your mileage may vary. I know that some people will not app a card that doesn't report to all three.
Thanks for sharing! Will definitely need to look in to my alma mater/hometown's credit union