These really put out the heat and we're using them for chilly AZ nights on the screened porch.  Very comfortable.  One arrived with the a few problems -- it was hard to screw in the propane cannister becuase the connection was misaligned.  Also, the company logo fixture was attached in the wrong place -- not a biggie, but still not good.  

Pros: Easy to Use, Efficient.
Cons: Inspect carefully when they arrive.