1. I cannot comment on this as I have not really used it for a very long time.I think I would agree with Earth's reply on this one.
2. I have to agree with Earth on this also.If someone had a bad experience with Norton they are obviously not going to speak fondly of it and nobody is going to change their mind.
Personally many,many years ago there were many problems with Norton especially on uninstall.Even with the removal tool it didnt completely uninstall it.Which led to conflicts with new products that were installed.Many machines were messed up some needing reintallation of the OS.Hence where you get the "Norton is like a virus" comments.As far system slow down I cannot comment but this depends on the system and other programs installed on the system.
I imagine though if you really like the product then chances are your not going to uninstall it.I am sure it is much better now then it was back then.