Create Patch Software?

daenur says : I wonder if anyone has tried patching software like PatchFactory (http://www.agensoft.com)?
"... reduce your software update size by 90-99%", "...the patching engine is not content dependent" and finally their "patching engine performance comparison table" (at http://www.agensoft.com/products.html#comp_table) look very appealing, but what about the reliability and OS compatibility of the prepared patch package?

Thanks.