I am delighted this adapter that works perfectly on my MBA13 / 13 Macbook Air (Late 2012), I specify that I have the image and the sound.
I tested both directly connected to my MBA13 but also connected to a dock / dock Thunderbolt (v1) from home and Belkin also met with no worries.
My screen is limited to 1080p (Samsung F2380M), I did not test higher resolutions.
In any case, I recommend this well finished adapter, attractively priced and perfectly doing the job! ;)
@ Soon