The Sega Nomad was a similar idea too, allowing you to carry around your genesis in a handheld. I bought my turboexpress back in the early 2000's before it got too expensive. I kind of want to get an Atari Lynx as well, because it isn't too expensive on eBay right now.

The turbo duo would be awesome to get ahold of. If I do I will make sure to post about it.