I've not but a pal of mine says they burn through the battery, due to losing the mirror which means, they are constantly using power.
Most reviews say real world shots are far higher. My camera is a Sony A77 SLT so has an EVF. Absolutely no issues with battery use and that is even with the GPS turned on which according to those who don't own one kills the battery!
No ta, More chance of me going to the moon than buying a Nikon , I can use mirror lock on both of my Canon DSLR's, Looking for something a bit different and smaller, My 5D with battery grip and 24-105 lens is quite big, It's huge when I put my massive 150-500 Sigma on it
https://shop.fujifilm.co.uk/digital-cam ... efurbished Something along the lines of this.