Product review (5 stars): Works perfectly when in good condition
I purchased this used and found it had one bad thermoelectric cooler (Peltier device type 12706) and would only cool to 50 degrees F.  I replaced it with another Peltier device (cost:  $5) and retested it - it will now cool down to 34 degrees F.  So if you're having problems, one of the two coolers is bad.  This is also available under the Haier brand.

It also cools quickly, four electronic computer type fans running at less than half speed keep it very quiet, and electronic thermostat (unlike the old clicking relay Koolatron) runs reliably.  The magnetic door seal is very tight.  Future failures would be easy and economical to repair.