You can use this thread to report about supported Skytraq devices or about experience on using BT747 with Skytraq devices.
At the moment of writing, BT747 only supports Skytraq log conversion, but support for log download is underway.
If you wish, do not hesitate to create a separate discussion topic.
I got a CanMore GT-730F(L) GPS Dongle with Data Logger to have a hands on evaluation of a device with a Skytraq Venus624 GPS inside. I was pretty surprised to find that it did not have a battery allowing it to log positions without USB power. The performance on my desk is not exceptionnal compared to the iBlue 747 A+, but for the moment I blame the design for it - not the chip.