I stopped using the surfix system, for me it doesn't fit in my workflow as well as a regular can of oil applied with a brush.
The applicator in my eyes was the weakest point of it all, the sponge is basically for 1 use and then throw away because it hardens. So that is the first part i abandoned, then i just used the bottles to squeeze the oil out and wipe with a rag, very messy.
Now i'm just using osmo oil with a brush, goes faster and works cleaner. And if you put the brush in spirits you can can keep using it forever.
The surfix is ideal for those oiling kitchen worktops on site and such, it's not for big jobs or frequent use i think.