I had a my first hands on experience with a playable demo of HD 3D a few hours ago.
Both the special de-bit [whatever that is] PS3 & Sony LX9000 3D TV had been bought over Japan.
I found out that the special PS3 had system software 3.21, not the new 3.30 that came out yesterday that is for playing 3D games.
If this had any bearing on how HD 3D played or looked would be a guess by me.

The playable demo only had Racebox usable, with Venom & Flash speeds of Vineta K.
This looked quite a bit different than the none playable 3D demo I saw earlier in the week.
It seemed far less refined and there were numerous strange artifacts plus a few strange handling problems happening while racing.
I wouldn't be surprised if this was the same playable demo seen at E3 almost 2 years ago.
Well I hope that's the case because I was a bit disappointed TBH.

I was playing in Cockpit view and the HUD zoom effect was switched on.
Having the HUD effect on might of been the overriding factor on what made playing the 3D demo a bit of a disappointment in retrospect, stuff happens.

So that being the case I think it would be unfair to comment on HD 3D until a few things change.
1]It's a known release version.
2] It's installed on a normal PS3 that has the optimized for 3D gaming, 3.30 or later system software.
3] It's shown on a production model 3D screen.

If it's any consolation Super Stardust HD 3D left me feeling the same.