These are really good oilers. I suggest that you use the magnet with them.
I have two. The line follows the same rout on both. On one I used the copper tubing sent with the oiler and it was exactly the correct length.
On the other (shown in the pictures), I used 1/4" pipe, tubing, and a screen filter. This is a fairly new rebuild and I want the filter to catch any fluff from the transmission bands.