Difference b/w one step and heavy duty surfix?

[ear3]

I've been seeing so many compliments on the FOG about the Surfix that I'm thinking of trying it out.  I was just wondering what is the main difference between the Heavy duty and the one-step surfix, other than the obvious (that the one-step has added wax).  Is the one-step as good as me applying the Heavy duty and then finishing off later with a wax polish? 

And on the website, it looks like I can only get a the applicator filled with heavy oil -- does that mean if I want to get the one-step (or the outdoor for that matter), I have to buy the applicator (filled with heavy-duty oil) and then the one-step refills?

 

[grobkuschelig]

I was under the impression that you had the choice to get:
A) each oil in a small container/tin box with applicator
B) the duo-refills for each oil
C) the surfix set in a sys3 containing all three (which coincidentally arrived at my doorstep a couple of days ago)

I have not been able to try it.
But to my understanding the "heavy duty" was meant for expected hard-use/wear areas, while the one-step might be used on some less used things like a bookshelf or so..