Oh, the Express is for traveling, they do not like being turned on all the time. My old AirPort broke when my nephew and son were tossing a ball in the house and it took a hit. I pressed my trusty Express into duty as a stop gap that seems to have lasted about six months, or untill the Express crapped out.
I see your anecdotal evidence and raise you mine.
I have two Airport Expresses and both have running constantly for several years with no issues at all. One was the main router and one extended the network and acted as a wireless printer for at least two years. I have since upgraded to an Airport Extreme and re-purposed the one that acted as the main router to for airtunes only. These little boxes are awesome.