It slows down my system, I can't turn it off (if I want to do something resource heavy whilst disconnected from the internet), it seems to have some problems updating and even after I turned the link-scanner off, I still get occasional cookie warnings from linked sites on Google so I'm not convinced it's gone.
Oh, and because I have the linkscanner turned off (it was thrashing my bandwidth limit) it shows up permanently as having an error in my system tray. Which makes it a lot harder to see if there is a genuine error.
Thankfully the last couple of weeks it seems to have forgotten its habit of deleting my cookies at random every couple of days. Though it still causes M$N to freeze up when I sign in.
But I still use it because it's the best I'm aware of. So in a sense I guess I'm glad to see that I'm still using the best, even if it's a pain in the arse.