Apparently there are two versions of this card after calling for some details. One has a credit line limit (platinum) and no-limit (signature) doesn't. Any of you getting a Visa Platinum vs. Visa Signature version of this card? If so, what's the difference (better) of the two?

Would the platinum disqualify applicants from the 50k bonus? Thoughts/experience?

"MILEAGEPLUS EXPLORER CARD: You will first be considered for a Visa Signature card. If you do not qualify for that product, you will automatically be considered for a Visa Platinum card, which has different fees, benefits, and credit availability."