It's got some nice new features with the login by url thing eg
http://user:pass@somewebsite.com it checks with you first that you wanted to login and then subsiquent pages it checks that your not being decieved and such. Nice feature but it wont trust a website so every page you goto in the secure connection it keeps asking you over and over.
Both myself and my housemate have changed the theme already as soon as we installed it !
Havent had any problems with ad block as i dont use it, in my experience no need it's built in popup blocker does a good enough job.
K