Summary: So far so good. Coupled with Sony A6000. PROs Own this zoom for about 1 month. Does perform well. Cannot judge of how fast it is, but compared to my former 18-250 Sigma (for my Sony A57), it seems better. Sharp focus. Good stabilization at max magnification. CONs It is heavy, but not as heavy as two zooms to cover the range of this one.
Excerpt: This is a solidly built, nicely made lens. Fit and finish are very good. The lens mount is metal, locks up smoothly and correctly. The zoom and focus rings are nicely ribbed rubber. The zoom ring rotation is a bit tight, but smooth.Back to back comparisons w/ Canon EF-M 18-55 STM and EF-S 55-250 STM: Autofocus seems about par w/ both Canons. Image Stabilization (VC) does not seem as good as the 55-250 at the long end when hand held.
Excerpt: I wanted a travel lens for my Sony Nex7 as I was tired of changing lenses on the run. The Sony lens that I was considering was too heavy and made my camera clumsy. I found this lens at the Tamron Expo exhibit and returned the following day for a second look. As soon as I held the lens it felt right. After I attended a lecture from a professional photographer that uses the lens with his Nex7 camera I made the decision to buy it.
Pros: Consistent Output, Fast / accurate auto-focus, Lightweight, Strong Construction
Summary: This lens works great for all general purpose pics. With one kid in sports and another learning how to walk, I needed a good lens that could take telephoto shots while also allowing me to take portraits and close ups with having to change lenses all the time. This lens does just that. It is a little bigger than the stock lens, but it appears to be a slightly bit smaller than the Sony 18-200mm lens.
Summary: Overall, great lens. The limited/slow f stop could be better. f3.6 at 18mm and f6.3 at 200mm. This makes it primarily a day-time lens, however... Image stabilization is the best of the NEX lenses. It's almost sticky-like. Why is this not talked about more!? You can move the camera around and watch it, it doesn't move or barely moves. This is much better than the Sony NEX OSS lenses (in terms of image stabilization).
Summary: The quality of the pictures are the same as the Sony lenses. Reason for the 5 stars is that you can carry a single lens to cover the 18-200mm range. Decently weighted to give you a solid feel. Unlike Sony lenses, when zooming the lend had a very rough feel to it. Could be a con for dinner people. Compared to the Sony kit lens (18-50 mm), when switching on the camera, the camera takes a slightly longer time to start up.
Summary: From my uses this lens is as good as the kit zoom, but with an 11.1 zoom ratio versus the kit's 3.1. I use it on an NEX-6 and is seems to focus more reliably than the Sony. IOW, I've had trouble with the Sony failing to focus, whereas while the Tamron 18-200 might take a small moment longer, it is more reliable. There is a zoom lock that prevents the lens from extending (zooming out) while hanging downward on your neck strap.
Summary: This lens is very sharp. The vibration compensation works very well. I'm very happy with this lens. I use it most of the time with my camera. Update 7/19/2014 This is my go-to lens. It has been used on these Sony Alpha Mirrorless Interchangable-Lens Cameras: NEX-5R, NEX-6, NEX-7, A6000 (ILCE-6000). I've owned it for 16 months and have no complaints whatsoever.