PixyMisa
Persnickety Insect
Whether or not matter exists is actually irrelevant to the claims of science. Matter appears to exist; if you emphasize the "appears", you agree with hammegk, and if you emphasize the "exist", you agree with Tricky.
Or more simply, we define "exist" as "what matter does". The metaphysical basis of existence is irrelevant for all practical purposes, because what matter does is exist.
So the answer to the question, Does matter exist? is Yes.
And the answer to the question, Does matter really exist? is You're not paying attention, are you?