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I just PC'd Platinum to QS yesterday!
Here's my post for more info: http://ficoforums.myfico.com/t5/Credit-Card-Approvals/More-Capital-One-PC-Success/m-p/4777226
If they don't want to up my limit significantly or give me another card like the Quicksilver with a decent limit I'm just gonna cancel it.
Cap1 did not change my limit on the PC, though I did ask. As stated in my post, I've only had the Platinum for about 6 weeks. I did request a CLI, and received the 2-3 day wait. Likely too soon, but according to multiple posts, and the person I chatted with, Cap1 does soft pulls for CLI, so no harm no foul. I relate to the low limit problem with Cap1, but I reminded myself that the Platinum is targeted to "fair/good" credit, while the QS is "excellent". So a low Platinum limit might not accurately reflect the growth potential of the QS.
Good luck regardless!