Installation went fine (I installed Magpie 2 then upgraded to Magpie 3 as I don't have a v3 only disk). The Magpie 3 installer verifies that v2 is registered then uninstalls it before installing and there were no problems with any step.
Once installed it works fine with all the logger schemes I have. It will contact ftp sites and download data from telemetry linked loggers with no problem. Graphing is all as expected too.
The only small error I have noticed is that the toolbars don't auto adjust their size when icons aren't present for a certain screen. This doesn't affect the running in any way.
I haven't tested direct serial communication with a logger as yet.