The strange thing about the Gamepark is that it exists at all. However, its very existence is a testament to the weakness of other players in the handheld gaming world, including our friends at the late, great Gizmondo.
https://gizmodo.com/gizmondo-exec-crashes-ferrari-creates-crappy-handheld-156252
That said, there are two new Gameparks hitting the streets, the XPG and XPG Mini. The XPG has an SD card slot, Wi-Fi, and a DMB video tuner. The mini is much smaller and has no Wi-Fi. Both of them are open source and run all manner of games, including multiple emulators. The XPG will be about $300 while the Mini is about $150.
Gamepark XGP, XGP Mini Portable Game Consoles Announced [MobileWhack]