RollerCoaster Tycoon 3 demo... ouch!
For me at least, the demo works pretty well, with only a handful of minor graphical glitches. I like the direction Frontier took the game, and it still sticks to Chris Sawyer's gameplay. My only disappointment, or I should say affirmation of my fears, is that the minimum requirements are entirely absurd. Playing the game generally gets me 15-22 fps, which is fine until you go into the "CoasterCam" mode where you get to ride your creations. For that to work well you no doubt need a Doom 3-capable video card.
Few games have ever been as important to me as this franchise, so I hope that the retail release in about a month gets the most thorough QA possible.