Product review (3 stars): Not bad for the price. Poor customer service.  Temperature and power tested
Having read the reviews about the lowest temperature this gets to, I was skeptical, but decided to buy this one anyway.  Mostly because of the price and the fact that it fit almost perfectly in the space where the old one was.

Although this is NOT meant for built in spaces, I had a planned workaround.  Anyway, my first tests were with the fridge in the middle of an 80F room with plenty of air circulation and no direct sun.  Note that this unit does not have a condenser fan (the fan on the back of most larger refrigerators).  Instead, the coils are behind the side panels, so they do get very warm.  Anyway, because there is no fan, you should not use it built in.

So how did it do?  I used a temperature logging device with my laptop and a power meter.  On the maximum setting, it cycles on for 30-45 minutes and then off for about 30 minutes.  It uses about 80 watts when on (0 watts when off, unless you have the LED's on so maybe a watt) and the temperature ranged from 35F to 45F with a median temperature of 41 (that's what a can of beer or soda would be at any given time because of its thermal mass).

80 watts seemed like a lot of energy for such a small unit, but since Amazon doesn't provide energy data for these, there's no way to compare.

Just for grins, I tried putting the unit in the cabinets (with 1/2" side clearance, 2" on top and 4" in the back) with no modifications.  While it did cool about as well as in the open, it ran almost continuously, turning off only for about 5 minutes every 2 hours.  That would be a huge energy hog so what I did was put a ~5" diameter muffin fan in the side of the cabinet such that it drew cool air from an adjacent area (the drawer section) and exhausted it into the area where the fridge is.  Since the only openings were towards the front, that gave good circulation all around.  I had an old Sears Craftsman power switch that I wasn't using (the kind normally used to turn on an accessory when a tool is turned on) that now turns the fan on whenever it senses the fridge is running.  The added fan draws 10 watts, but it keeps the fridge from running constantly so it will save electricity.  In fact, it may actually may run less than when it was in the open because of the added air circulation.

I find the unit is quiet (sorry don't have a decibel meter), but it is in the family room where the TV is and is not objectionable.  Even when it was out in the open and not in the cabinet, it wasn't too loud.

I wish it was more energy efficient, but considering the price it is a good buy.

UPDATE 8-9-12:
I found that having the blue LED lights on affects the temperature inside.  That's because the power supply for the LED is in a section of the housing where the thermostat is.  If you have the lights on all the time, they generate a small amount of heat which makes the thermostat think the whole fridge is warmer.  Thus it will run longer and get the inside about 5 degrees colder.  This could explain why some people say the temperature inside is too warm.  If you want to get it colder, try turning ON the blue LEDs!

I lowered my initial rating from 4 to 3 stars because of poor Haier customer service.  I needed to get a new plastic plug that covers the hole in the door left from reversing the hinges (it was jammed in so tight and it is soft plastic so it got mashed up when I tried to remove it).  The manufacturer basically said too bad, you have to buy a new one!  This is for a part that couldn't cost more than a quarter.