The 55-210 is just as fast as the 16-50 and the image quality is a tiny bit better then the kit lens. I have 4 E lenses (28-70; 24-70: 16-50 & 55-210) and the AF speed of a6000 with any of those lenses is lightning fast.Just got the a6000 yesterday ... got it with the kit lens 15-50+55-210 ... the local Sony store gave me a really good deal (paid $950) along with free Sony camera bag and a Sony 16GB card. Have just done some random "test" shots and can say that it puts fun back into photography ... one has to use it to understand how fast and accurately it auto focuses even with the little pancake zoom lens. For times when weight is an issue, especially on business trips etc, the a6000+16-50+55-210 make for a great little package to carry around without worrying about weight and space and still get great images. The optional $5 camera apps (which can be directly installed into your camera wirelessly) make this camera a stellar performer for beginners who have no interest in post processing ... even the $10 timelapse app makes child's work of getting awesome timelapse videos without having to do any post processing whatsoever. The good part is that you don't have to buy these apps, when you upgrade to another Sony mirrorless camera including (even when you decide to go full frame), once the app is purchased it can be installed on 10 cameras.
I quickly tried out the a6000 at a local electronics retailer, and the AF is stunningly quick with the 16-50. It gave me a real shock how relatively slow my NEX-6 is. How is the AF speed with the 55-210 by the way? That lens is optically not a stellar performer but I'm curious how fast it can AF.
And how about the menu structure? I like the controls on my NEX-6 but the menu structure is inefficient and exposure compensation is a little bit fiddly.
I was surprised how square-edged the a6000 body is; I prefer the NEX-6 in that sense. I do have to convince myself that I don't need the new fast AF because I use mostly manual primes with the 6 but yeah the new camera has made me a little itchy.
The menu structure is same as my a7, so I found it easy to navigate. The a6000 with the 16-50 kit lens is so much fun to use and easy to carry around. It seems to give the best image quality when paired with my EF 85 f/1.8 & EF 70-200 f/2.8 L II IS (using metabones adapter), so much so, I am planning on selling my new EOS 70D