Just perfect. Despite the instructions and on-line guidance I still struggled to install at first, so this is how to do it. Install drivers from CD - just click on "drivers", Win 7 will do the rest. Then find the Comm port on your computer and change the baud rate to 4800. The supplied GPS test utility on the CD didn't want to work for me but the one downloaded from the manufacturer's website "support" section worked fine, and there is extra guidance for Win 7 there too. The GPS receiver instantly locked on to satellites and gave the right location, although my desk seemed to be traveling at up to one knot at times.
Very easy to connect to a navigation package too - just Comm port and baud rate to set to match the GPS and it was away, showing my location instantly.
But the strong magnet is worrying - must keep my credit card and ship's compass well away from it.
Otherwise, just perfect. Highly recommended.