I have been using galaxy since last march.and I am fully satisfied with this.i also used some other phone from Samsung but there was something like lagging stucking after few month but I didn't find it in galaxy s6 which is great.
Also the handset is looking very nice I like the Interface.and the dispaly quality is awesome. the hardware is durable and software is quite nice and smooth. The battery backup is awesome I can use it for fully one-day with heavy work. Overall I found it's a great phone.