I noticed when i adjusted the screen brightness to full (100 percent) on both the SP3 and the SP1 and had them beside each other that the SP1 was much brighter att full brightness compared to the SP3. I dont know if it´s that much but it´s clearly a visible difference. Is this only happenening with my units or do you also see the same thing in yours if you compare them with each other? I would appreciate if somebody could check this thing with your units. P.S. Both units are i5 and the SP1 has 128 GB and the SP3 has 256 GB, if that for some reason should matter?