I have had no trouble with Ethanol fuel in any of my equipment (including my 2 stroke leaf blower and trimmer). I think this is due to my constant use, and I drain the fuel after every season. When I was first starting out, the carb would get gummed out all the time on my leaf blower, shop said that was because I was letting it run long enough. Now I cut 2-4 on the same street with the mower, then the trimming, then the blowing (so it runs a few minutes that way). No problems since...
For most houses, self propelled isn't really necessary, they are heavier. And when you have obstacles, and have to back up it's a pain. But I have at least 7, where it's a major benefit. And since I plan on doubling next year, as I intend to hire extra help, it will be needed.