The Eten G500 is the first PDAPhone with a built-in SiRFstarIII GPS chipset and it is only the second PDAphone with a GPS after the HP hw6515 released in August 2005 in Europe and late 2005 in the USA (reviewed here). I've been testing it for a few days, mostly looking at the GPS aspects but also at the Bluetoth Stereo A2DP profile in combination with the Globalsat BTH-820. For a closer look at the PDA and phone features, you can take a look at this article on msmobiles.com.
Good news, in spite of the concealed antenna and contrary to the Qtek G100/Pharos 525, GPS performance is preserved as seen in the side by side comparisons with the Asus A636 (SiRFIII GPS PDA) and Globalsat BT-338 (SiRFIII Bluetooth GPS), references in their format.