Same.As a former Apple technician, I would not be looking forward to this change. People would always come in running the Beta OS and complain about the bugs and such, was even worse when they would come in for a hardware repair and we couldn't service the device until it was downgraded. As a customer, very cool and happy to see these changes coming.
I'd personally like to be able to side load apps (other than compiling/signing them through Xcode).
But I do think this could lead to some pretty nasty security issues for the majority of users. I wonder where the line is drawn on Apple potentially blocking known malware even if it comes from another store, and/or if guards are still in place over apps that try to use private APIs in unexpected ways.