I installed the 15 day before activation version NAV 2004 pro, it didn't cause a slow down in rebooting, maybe about 10 seconds, but it abused my notification area. A lot of notification area icons went a.w.o.l. I read a few comments, it didn't slow my connection down still at around 600k ( yeah my mum finally got me broadband wahoo me up from 20k) but it was a drain on my 512 meg of pc 133 ram. I reinstalled V2003 in system works. I remember the same type of comments when trying beta's posted here there n everywhere when V2003 was released.
So when my subscription runs out, for some reason it isnt untill 11:1/2 months from now (I was having problems with a component not installing so I uninstalled it, with NPfire, sys works etc and it restarted my subscription from last Saturday week when I reinstalled the V2003 versions to correct a problem).
So I guess I will wait for the V2005.