I used a YJ for awhile until the seal blew and it kept getting harder to get the schraeders to hold. Then I tried the Appion one and its superior to the YJ. Its beefier and the only one that's vacuum rated. Looks similar to the uniweld one but the Appion one is like $50
Like fianders said I have never found grainger efficient for my refrigeration supplies. They are all about profit margins there. I am not even aloud to pick up filters or belts from them because of their price. Only for emergency or hard to find anywhere else kind of situations they are great for.
i found the core remover worked well the first few times but after a while the shrader got harder and harder to get out and i then realized that the gasket inside the tool wore out. i was forced to buy another one with a ball valve instead of a screw nut that tighens. Well i havent had any chance to use it since but it seems to be better.