I use both manual download and the CC. Both work fine for me.
It depends on your internet bandwith etc.
I have a 3 gig a month limit because I'm in a rural setting and have to use a G3 network.
So my DAW is off line.
I take my laptop to a good connection and I download directly from my account, take that home and load it into my DAW and install/ update without issue,,, just like it was before CC.
The first install will require reading up on "offline installation". as you'll need a registration key they e mail you.
While I'm on a good connection I also run CC on the laptop and update Sonar using that method. It's certainly easier than the manual method, so that would be my first choice.