And great move Larian to extend the alpha/beta to everyone. I pledged pretty high and am only happy that all backers get access if they want it. Not only is it more inclusive but as you say it will enhance the pool of useful feedback to adjust and polish the game for everyone.
To offer refunds for those that pledged specifically for alpha/beta is only fair, but I hope people don't take them up on this. After all, the whole point of the kickstarter was to make Original Sin a better game. I have great respect for how Larian have followed their dream in self-publishing and creating a classic-style cRPG, before the kickstarter phenomenon had made such games relatively popular again. They truly care about such games, enough to put it all on the line for one...
For the good of the game.
