The stabilizer is very effective and virtually inaudible.
The close focus to 250mm (about 40cm) is very produces good quality pictures.
Very little distortion: slightly visible at 18mm, it is easily corrected with Photoshop or with ShiftN.
Many vignetting, it is still visible at 250mm at f / 8 ... fortunately, again it is easily corrected by software.
Finally, dive, which is remarkable at all focal lengths. This is the strong point of this, as good here that my 15-85mm on my Canon 60D!
To my knowledge, a good extreme transstandard, better than the Nikon and Tamron PZD 18-200VR I used too.