I got one in Nikon version.
I went for it due to price and me only using it occasionally.
First impressions are good. Build quality seems fine, the movement of the lensy bit is nice and solid and doesn't feel like its going to snap off in your hand.
TTL works fine with my D80 and I like the slave modes.
I cant compare to a nikon flash as i've not used one but for me this one seems fine.