A really good accessory for Lumia 925 in addition to wireless charging adds protection to your phone. The shell is solid, very stiff and with its 3mm at the bottom (1.5 mm in general) puts the dimensionally phone on par with the Lumia 920. Very easy to put around the phone which then are secure and no contact problems between the connections. An empty battery to be fully charged in about 155/170 min (0.65 / 0.59% per min) with DT-900/901 which is pretty good. (Original Charger AC-60 load on 120 minutes ie about 0.85% per min.)
The underside of the shell is similar to the back of the phone and is not in any way slippery even though the surface is very smooth. The edges and bottom of the phone is well protected, but the sides and the screen is completely exposed and are relatively protected only in the case of flat surfaces. According to me, the wireless charging perfect for the office where you answer the many calls and on the night table especially when you are sleepy so if the extra cost and clumsiness is not a problem, I heartily recommend this product.