LONG STORY: By the time I was ready to buy, after a test drive, I could not find my preferred exterior/interior w/exact options I wanted, available (I searched WA, OR, and CA). So I decided to wait and do OSD next year. But in late May, I rented an S90 T5 Momentum for 10 days (Sixt Rental, Sea-Tac), when visiting my daughter in WA. I decided it was as long as I wanted, and did NOT want the longer 2018 version. So, while still on vacation, I searched for the closest I could come to my preferred choices, hoping to get in on their Memorial Day Weekend sale. Volvo Bakersfield had all of the options I wanted, and I felt I could live with Onyx Black. They agreed to accept a $500 credit card hold, until I returned to CA from vacation. The day after I returned home, I got approval and a check from my Credit Union, and my son and I drove to Bakersfield to get it. I am now completely smitten with Onyx Black---and Mussel Blue seems almost boring to me now. LOL. In addition, mine came with Polestar Optimization--and I cannot believe how much smoother it accelerates and decelerates. My $45 investment in joining the Volvo Club of America saved me $500 too (best investment ever made). I would urge any S90 T6 owner to strongly consider adding Polestar Optimization to it.