Black Knight kicks provent-a-mites butt....LOL, of course that is IN MY HUMBLE OPINION and based on MY OWN OBSERVATIONS only....so Pro Products, no threatening lawsuits, please!
I have used both, I own both, the Black Knight was effective by using it one time only, while Provent-a-mite had to be used more then once, which means your reptiles are around those chemicals more often.
Also, price was a big factor. Black Knight is a far bigger bottle and cost me less. Since I haven't had mite problems in a long time (thanks, Black Knight) my can should last me a long time.
Its a shame they were forced to stop selling such a great product...And yes, for me thats reason enough to stop buying pro products, and I know many people who feel the same way.
Again, EVERYTHING IS IN MY HUMBLE OPINION ONLY!!!

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reps-r-us