Mostly, I have been very happy. But it is mixed.

Good things:

• Brought "prediction markets" concept significantly into the mainstream
• Advertising, lobbying, huge $$ backing -- all of this gives prediction markets more cultural power
• Vindication for me, having backed this idea for 20 years -- I always knew it would be big

Some bad things:

• Overfocus on sports gambling -- this will probably lead to horrible backlash, as it did with cigarette smoking.
• Blurring (unfortunately) the line between "investing" and "gambling" -- this is something I had hoped would go the opposite way.
• Very slow to adopt conditional markets -- should have been in there by Year 2. And even now, they are just imitations of parlays. Very disappointing! Huge missed opportunity to take the moral an intellectual high ground.