I haven't noticed any problems with the website that weren't there with previous versions. I think it is just a new shade of lipstick on the same pig. Changing flights in a schedule change situation never worked for me before, I always call.
The one thing I can't stand (although it is just one extra click), is that there is no "logout" button anywhere but the home page.
Welcome to FT. Nice username BTW, gave me a chuckle.