I've fished the one on the SGL. Through the SGL it's fairly large, as brookie streams go anyway. I did catch fish but it wasn't what I'd call "good". It's not a real long stretch, and too much of it is kind of flat water.
That said, above where it crosses the road (near the gun range), it looks somewhat smaller, goes into some thick briary type stuff, and is posted. I have not personally fished this section, but am told from sources I trust that it is much better in this section.
Below the SGL, it's stocked and bigger, but holds a fair number of wild fish as well.
There are a number of good streams in the Schuylkill Cty area, but many of them have posting issues, at least for portions of their lengths.