The client doesn't matter.
Consumers will never download a client. Never, ever, ever. The standard qt client is for pro miners only - and completely irrelevant for normal users.

It's all about the online wallet.
- and giving consumers a nice, simple web interface to do their mining. Drop and drag, click and done.

Here's a screenshot of the beta growth accounts.
I think it's pretty sweet, might even say "beautiful and grandma-friendly."

http://i.imgur.com/rCFK7pj.png