I feel that the previous build was much better. I've had to soft reset twice already. Phone is very laggy and unresponsive. Also lost use of the standby button, until I reset the phone. I'd wait for the next release, if I were you.
I would agree with that. Some of the good things in 8.1 gone and mail and contact functionality poor and very small buttons. Hope this gets better near impossible to go back.
If you have 8.1 working I would stay but if you put it on a second phone fine but at the moment it is in developer mode and stuff is being fixed as they go. You can kind of see where it will be in a few months time but there is pain ahead.