Eldar has finally written up his full review of Mango on his leaked handset and posted it on Mobile-Review.com.
In the review he spends a lot of time comparing the OS to Android and a lesser extend iOS, (and I think conflating functionality from 3rd party apps like Dropbox with built-in features) and he eventually concludes:
Repeat a simple idea – Mango as a positive update for Microsoft, as it gives new possibilities of the operating system. Speed ??development of new features is rather small, at least for one year is a little bit. While this operating system acts as a catch-up with respect to iOS, as well as Android. In the autumn we will see changes in the opportunities presented by each of the systems, first reported by Microsoft, and certainly by the time of Mango in the update will include new features that are not described here.
Operating system from Microsoft will suit people who do not require maximum functionality from the phone, oriented to voice communication, SMS, is not shy of social networks. A fairly simple operating system, which features high speed, very simple interface, which is not always logical and optimal. Losing ergonomics iOS, the OS performs its alternative. At the moment this product is comparable to the fact that Apple had a year after the launch of the first iPhone (I’m not talking about specific functions, rather, about the speed of development and experiences). Direct competition and comparison with other operating systems while WP7 loses, but the important thing here, how quickly that system will evolve. Important is the speed of development, rather than the presence of various functions at the moment. Until the update comes out once a year, a reasonable time for catch-up system – twice a year. The system, of course, largely designed and targeted to the U.S. market. How much heat it will be in Europe or Russia, we see the fall of 2011. It should be noted that the first sale in European countries were very modest. With the advent of updates and new countries will not change dramatically, but may improve. It all depends on the perception of the OS users and that they will talk about it.
Read his full review here.