I never installed the tm electronics, you don't need them to use a tm or virpil stick. Iirc the option is there so you can map your buttons as a tm wh, but use the axis from the fssb. I just remapped the buttons for the fssb base.
But as far as installation goes, very simple. They have a tutorial on their Youtube page, it takes a couple of minutes with a screwdriver.
I think the postage was fast, it ships from spain, so a couple of days :)