Just wanted to share my success. I have had my QS1 and Plat card for about 2.5 months. Both starting limits at 500 each. I basically hit the LUV button once a month and get the 2-3 day message. I used the cards heavily and PIF multiple times a month for regular bills, groceries, etc. So today, I hit the LUV button and got increases on both of my cards. QS1 went from 500-> 1500 and Platinum 500->3000. I am in shock!! I am hoping with regular use and PIF I will see even better limits. As of right now, these are my only two credit cards. I am rebuilding my credit and glad they have given me a chance to prove it.
Good luck to those hitting the LUV buttons!!