Product review (4 stars): Temperature is a problem, but good product overall
I'll agree with the other two comments--temperature is this product's downside.  I have also seen the back panel frost up (although mine was below the normal setting).

That aside, it does keep the keg cool and the beer fresh.  I've had the lines freeze up on me once due to the line coming into contact with the back panel too long.  Besides that, it's been a trooper.  Guinness from the tap never tasted so good!