Has anyone seen this animal called "Super Fun 21"?

This seems at first glance to be a pretty good game, but perhaps someone has run some sims on it, or will do so, to check. Here's the rules:

~Double on any cards, even after splitting and hitting, including aces;

~Split up to 3 times;

~Late surrender on two or more cards totalling less than 21, even after hitting, splitting, or doubling;

~Any hand totalling 20 or less, with 6 cards, pays even money instantly (except on double downs);

~Any hand totalling 21, with 5 or more cards, pays 2 to 1 (except on double downs);

~Any player blackjack is a guaranteed winner at even money (even if dealer has blackjack), except blackjack in diamonds, which pays 2 to 1

Thanks, in advance, to anyone who has analyzed this.

By the way, I'M BACK! I took a couple years off to go back to school - it's good to see that many of the old familiar posters are still here.
I just re-joined Green Chip, and I'll post this same query there, as soon as Stanford sends me my new password. See y'all there.