I've got a 4 or 5 year hold Honda walk-behind, self-propelled. Easily the best small mower I've every owned or used, although I do wish it had an option to side discharge, rather than being a mandatory bag or mulch.
But all mowers are going electric - which is a good thing overall. I just wish I could find a battery electric replacement for my 13HP Honda GX390 to bolt on to the walking tractor that drives the mower I use most (a 42" twin blade), my garden tiller, my snow blower, and my orchard sprayer. It's the biggest gas hog on the place, and every one of the uses would easily be better served with an electric engine, if I could get at least 60 minutes per charge, and swappable batteries.