I received my Ranger Thursday and finally got a chance to set it up today Saturday.  I did the initial heat up to burn residue. I set it for 450 and let it run longer then the 30 min just to check temp. It never got higher then 457 or lower then 444. That is only a 13deg variation from set temp. My oven probably varies that much. I am very impressed so far. At 5 pm it will get the Porterhouse Test. Stay tuned... With that kind of temp control I bet it would do a really good job at beef jerky. Of course using minimal temp.