I've been 1X with my road bike for close to 3 years now and love it. Simple, quiet, cheap (in comparison with electronic)... you just go up and down with none of the hassle or noise of a front derailleur.

Some of the custom cassettes (12 gears starting with a 9 or 10 tooth) allow for a huge range in ratios and the steps between are close enough for me (commuter and tourer in his 60s).