I have recently purchased the new Canon Speedlite 600EX-RT, and am quite impressed with its robust design and seamless integration with the Canon 60D. The menu is taking me a bit to learn, but seems logically set out.

I have made a few review videos if you are interested in having at look at the flash ...

Canon Speedlite 600EX-RT Unboxing and First Look -

Canon Speedlite 600EX-RT Review - "Hands On" First Look at the Flash and Review of Flash Head -

Canon Speedlite 600EX-RT Review - Hands On Review - Features of the Flash Body -