I agree with STLNST that the Yok is more inconsistant. From experiance I run at an indoor asphalt track and my XXX-S G+ works the same everyweek no matter what the temp of layout is. My Yok was fast but every week I would have to mess with it a little to keep it fast and consistant. If I had to change foams to another set it was worse even if they were the same compound tires. I really like the new SD but I think I would wait a little to see if they make some minor changes to make it more of a consistant car.
We had two guys show up last week with the new SD and it is a nice looking car and worked fairly well. The guys liked them but said the same thing that they were inconsistant but when working were pretty fast.