I've got 2 NavSpark Raw which I use to collect raw GPS data for post-processing and a number of older Raspberry Pi's which I don't use that often, one of which I can dedicate to this shield. I've also just purchased a Raspberry Pi 3 and I want to test its capabilities with RTKlib under Jessie. For a different project I am also going to investigate the use of the GPS as a timing device. The Shield appears to be well-made with very neat and tidy soldering. I'll be ordering a second shield for my other NavSpark Raw asap.
Hey Kevin, thanks a lot for your kind words, hope it will be good use for you! Looking forward to hear how the new Raspberry Pi 3 is working too, I did manage to see some differences for Pi 1 and Pi 2 when used for timing, while both works pretty well. Cheers, Greg