A little late for posting, but I haven't heard of anyone using them. The same with Clinique. But I use their oil free products.
I think the powder is recommended because the foundation stuff using the sponge, could put your own oils back in there.
Well, sounded good anyway. I just think the powder is recommended. I picked up some cheap at Walmart. Some powder OIL FREE foundation from Max Factor or somebody like that. Comes with a brush too.