Lasted less than one year
344069
Kenmore changes models faster than a lot of people change their shirts, so this posting is a general advisory based on my experience with Kenmore 1100 watt 1.2 cubic foot microwave 405.7212. I bought this microwave less than a year ago.  Kenmore no longer sells it, at least under that model name. This microwave broke within the warranty period of one year.  I look forward to seeing how  Kenmore honors its warranty.*

However, in looking for my purchase receipt for the Kenmore, I found the receipt for my previous Sharp microwave. I bought the Sharp in 2006; it broke in 2013 -- after 7 years of use. I replaced the Sharp with the Kenmore last October. I got 11 months of use from the Kenmore.  If you think of the cost of an appliance as the cost per unit of service, the Kenmore is not a few bucks cheaper than the Sharp; it is more than seven times as expensive as the Sharp.

Never again.

*12/11/2014: Subsequent to writing this review, I returned the Kenmore Microwave to Sears.

On the plus side, they honored the warranty and gave us the cash back.

On the minus side, when we brought the microwave back to Sears, the return required consultation with several different staffers in the appliance department. They were pleasant enough, but seemed to know nothing about Sears appliance warranties (printed on the back page of the instruction manual, which we showed them) or how to manage the fact that we had purchased the microwave online but had been instructed by Kenmore to return it to a Sears store under the warranty (showed them invoice from online purchase).  Altogether, the return required about an hour of meeting with staff and waiting while those staff met with their supervisors.

So this was substantially inferior to my experience at Lowes, Home Depot or Costco where you basically bring things back, explain that they don't work, and get your money back immediately (or a store credit if they can't find your proof of purchase). So while I will not again buy a Kenmore, for the reasons stated above, I also will not again buy a small appliance from Sears. The most casual perusal of Amazon small appliance reviews shows even the five-star models can sometimes fail within warranty periods. When they do, you want a simple seamless process for honoring the warranty.  With small appliances (unlike, say, cufflinks or an orchid corsage), you are not buying a "thing"; you are buying a stream of services.  The warranty is part of that stream.
2925121
Worked for less than a year, but then it died. We never turned it up past 200C. Waiting to hear back about the 1 year warranty.
3214220
Lasted less than a year.  Done-alarm is loud enough to make you jump and no way to turn it off.
1840874
Worked great till it just stopped. Only lasted ONE YEAR! :'(
4671892
Lasted just under a year.  Was using it to power a Raspberry Pi Model B+.  Now it has trouble powering on when plugged into the wall, like there's some loose connections inside.  Going to spend a few more dollars and get one that might last more than a year.  YMMV
1015330
Didn't last very long before it stopped working.
4792320
Purchased in October and it had failed by September of the next year. Not worth the price for less than one year of life
4796290
Didn't last as long as price would indicate, poor quality
3898475
Had for less than a year and it stopped working. Now makes a noise and will not be recognized by the computer.
824641
only one year using, not working anymore. I bought two. all dead.
2191041
Nice little heater with good output, but lasted less than a year before both the fan and heating element both quit.
1872811
Replaced and failed in less than a year.
Second replacement lasted a couple of weeks.
684447
Worked well for one year. And died on me just after one month of its warranty period. Not buying it anymore.
2173991
Worked great until it stopped working at all in under 1 year.
514450
We just bought this less than a year ago. When we pulled out tree out of the attic this year, the handles ripped off. I would expect this to last more than a single year... Very disappointing.
2758191
This hose lasted ONE year before splitting near the nozzle.
Certainly NOT the durability advertised or expected.
3266463
lasted under a year. worked well, but thought going with a Samsung card for my Samsung phone was a safe bet.