Have the software (Windows version) bought as download and everything has worked out smoothly. The improved performance in my opinion is noticeable (though I had my Windows computer and only relaunched). The new development features such as HDR development, the panorama tool and face recognition are really precise and operate tadelos. I had the previous version and was delighted with her. Let's see if the new version cuts off just as well over time. So the first impression the software is me 5 stars Value !!
Update: 17/05/2015 After processing of a batch of RAW files and conversions of these files into JPEG format, I have to say, unfortunately, that the performance is not exactly brilliant. A further development of RAW files during the conversion process (JPEG) was in Lightroom 5 already difficult and is not possible in Lightroom 6. In the Develop module, it takes a few seconds before you can edit each additional image. To this end, I prefer but then on the 5 stars 2.
