I jumped on this deal a few days ago. Great versions of classic arcade games, really polished and fun.
Just in case anyone's worried about redownloading, DRM, etc., it's a shareware style setup. The demo is the full game, and you only need to enter your email address to unlock it after registering. So you can redownload the demo as many times as you want, and it's mirrored all over the internet too, in case the developer ever disappears.
As far as activations, they encourage you to share the full version with friends and family (the registered game displays your full name, address, and email address on the title screen to discourage sharing it with people you don't know) , so it's set pretty high. And they promise an email to them will reset the count if you ever hit too many activations.
Also, if the activation server ever goes down (or the game can't connect to the internet), all copies become fully activated, so you don't have to worry about losing your game that way.
