I picked the up the my3D at Target yesterday and discovered that it's quite the cool new toy!
The product itself is very easy to assemble and works with a wide range of Apple iPhones and iPod Touches. All my3D games take advantage of the tilting features of the aforementioned Apple products. As of this writing there are 8 games available on iTunes, and all of them are free (note: you may have to update your iTunes software for the more intricate games). The games range from a space shooter (called "Tunnel Pilot") to playing as a shark feeding on fish (entitled "360 Sharks").
The games are designed for casual and non-gamers, but they are surprisingly detailed and lots of fun. I found myself hooked with the games and the 3D effects are decent in terms of the launch game titles that are out (I'm sure that in time, they'll get even better!). I had my mom, who's not a gamer (she is astonished at how people can effectively use a PS3 controller :), try it out and she not only enjoyed the ease at which she can play, but she had fun with the games as well.
You should be able to easily find these my3D viewers at Target. It's worth the 35 bucks and is fun for anyone and everyone. Hopefully Hasbro will create more titles; I see this device having lasting staying power if it catches on and Hasbro and company continue to create top apps for it.