Networking has definitely improved for SB1.00 to 1.03 compared to PB - I would regularly wait 5-10 minutes to drop from SC to normal space near a station, but not once have I had a wait of more than 30secs. I have also yet to have a CTD, which I did on PB on a few occasions.
Looking at the ctrl-b counters (which I do as standard practise) there is also a visible and measurable drop in the amount of network traffic compared to PB.
I think the networking has improved for people with good broadband lines with the improvement in the player matching and netcode improvements.
Some people may not have seen an improvement as their broadband is only ok enough to run elite and no matter how many improvements are made their line is the limiting factor.