I loved my Altitrack, but I think the JumpTrack software leaves a lot to be desired, and that takes away considerably from the package.
First, Altitrack works great, as advertised. It is beautiful aesthetically and ergonomically, resting nicely on the side of the hand. The analog movement is natural and easy to read. One comment: it does not show any more granularity than the typical analog altimeter at low altitudes, while technically it could.
JumpTrack is not so hot. First mistake: the product is Windows-only and uses Microsoft Access for its database. My software freezes or hangs or fails to import data at least once every time I open it.
As far as I can tell, the software will not import GPS.
I ran into a competitive product recently that looks superior: Paralog (www.paralog.net), which runs on Linux, Mac, or Windows, imports from GPS (jumps viewable in 3D on google earth), and supports digital logbook signatures (not sure if those are accepted by USPA, though I think not). Paralog, however, does not import Altitrack data, only ProTrack, Neptune, and a few others.
The Paralog software looks so good to me (and supports publishing to web!), that if I had it to do over, I would go with a lesser instrument than Altitrack so that I could use superior software.