Any pads will work with S1's polish.
The "magic" of their system has more to do with its user-friendliness than anything else. It works in the sun, doesn't cake up, is very easy to learn a rotary on, and the pads are nifty. However, it won't pull out that last couple percent like a dedicated finishing polish.
Much like
Meg's SOLO, Optimum, or any other pad dependent polish, it's the perfect solution for someone, just not me.