I use Schaeffer for all my commercial heavy truck needs and my personal stuff. I buy enough at a time that I get free shipping to my front door and they give me free oil sample kits and analysis with it. Not snake oil. They have been making lubes and oils longer than anyone else in N. America, since 1839.
Whether it is worth it or not, they cater primarily to commercial operations, heavy ag users, etc. They have some very solid products, but for the average user, unless you can get it at a good price locally, you can do as well using another product that is more cost effective. The most cost effective way is to know a commercial user and have them include what you want on their order so that you get the wholesale pricing and free shipping.
The Schaeffer rep, while correct, is really using the same marketing stuff that Amsoil does when he says it will last longer and therefore cost less in the long run. There is some truth to that, but most folks do not use any oil to its full potential anyway, so I am not sure it would prove to be "cost effective". For those of us that go thru drums of the stuff each year, yeah, extending drains and better economy can really show up in the spreadsheets.