Summary: The Qstar unit seems to log well, but the 5HZ rate is a little slow for motorsports. It's obvious that there is a lot of missing data in order to critically analyze corner entrance/exit. The software, even the latest download from the company's website is very difficult to use and has a lot of bugs in it. I hope a new version of the software comes out, because right now, I'd say that for my applications (motorcycle racing)the software is not useful.
Summary: The unit seems vary fast and accurate. The software, I primarily use the QTravel, is mediocre at best. They also require the use of a product key for the software which means you need to track the key so if you re-install on another machine you will have the key. The time on the GPS and camera seem to work best if they are both set to GMT. No OS X software available that I could find.