Product review (4 stars): Accurate for the cost
This unit seems pretty accurate.  It may underestimate the temperature by about two degrees, but it works well.  The humidity reading also seems accurate.  The numbers are easy to read, and both update in real time.  I did observe that if you expose it to an extreme temperature change (from a cold room to a heated room 15-20 degrees warmer) that it takes several minutes to catch up, but when the temperature change is within a few degrees (mild adjustments to the thermostat), it updates well in real time.