New user here & new owner of a CPO '12 3.8 Tech.
The finance manager at the Hyundai dealership where I bought my Genesis from quoted me $1,695 for the platinum $50 deductible CPO Wrap. This was the first car I ever bought from a dealer, and I wasn't prepared for getting a hard sell on a warranty, so in retrospect I went in to this negotiation completely unprepared. Said no to the warranty on that basis alone.
After finding this forum and this thread, I called Jim Ellis, got right through to Hau-B Cao, business manager. Got an immediate quote on the phone for $1,350 for the platinum $0 deductible. The rest of the process consisted of emailing him a scan of my drivers' license, he sent me a contract to sign, scan, and email back. The whole process was fast and easy and I didn't get any hard sell from Hau-B.
One detail about the HPP extended warranty program that I don't remember reading in this thread, is that there are 2 variants: one for (presumably) all used Hyundais, and one that's only for CPOs. The CPO plan is called the "HPP CPO Wrap" and it must be bought "at the same time" as the car purchase. The premium for the CPO plan is significantly less than the premium for non-CPOs, it's about a factor of 2 difference. So my advice to any CPO buyers would be to ideally call up Jim Ellis (or whoever else you might want to solicit bids from) and line up a CPO wrap quote before going through with your purchase.