I have switched to 1x for my winter/4 season road bike. I am running a 48t ring with an 11-34 cassette and an Ultegra RX DI2 mech.
So far it has been faultless and for my local riding area (South Leicestershire/North Northants/Rutland) the gear ratios have been fine. The only time i could do with an easier gear is on the steeper climbs, say 10% or above. Having said all that, if i was going to ride in a hillier area like the Lakes, Peaks etc I would most likely take my other bike with a double. Lots of long climbs would not work for me on the 1x but for the right rider/terrain, its great.