pointy eared one, your last comment about the humidity makes sense. Thats been the only time Ive had slight rusting, and in the end for me, as I keep track of all the maintenance on all the families bikes, I just went back to Phils as it has more "staying power" for all kinds of conditions and for when I dont get around to spending time on the rest of the families bikes as I would with mine. (plus, being on a car rack, can get rained on while on the highway--basically its less work and less rusty chains for me.
all that said, in dry sandy or cold condtions, I think those types of chain oils are great.
plus you guys do spend more time than I do, I'm a "rag" and lube feller, not keen on the roller brush thingees. Important thing no matter how we fiddle with our chains, is that we keep an eye on them. My system works well and my drive trains last a good good long time with minimum wear.